* sysdeps/sparc/nptl/sem_init.c: Delete.
* sysdeps/sparc/nptl/sem_post.c: Delete.
* sysdeps/sparc/nptl/sem_timedwait.c: Delete.
* sysdeps/sparc/nptl/sem_wait.c: Delete.
* sysdeps/sparc/sparc32/sem_init.c: New file.
* sysdeps/sparc/sparc32/sem_waitcommon.c: New file.
* sysdeps/sparc/sparc32/sem_open.c: Generic nptl version with
padding explicitly initialized.
* sysdeps/sparc/sparc32/sem_post.c: Generic nptl version using
padding for in-semaphore spinlock.
* sysdeps/sparc/sparc32/sem_wait.c: Likewise.
* sysdeps/sparc/sparc32/sem_trywait.c: Delete.
* sysdeps/sparc/sparc32/sem_timedwait.c: Delete.
* sysdeps/sparc/sparc32/sparcv9/sem_init.c: New file.
* sysdeps/sparc/sparc32/sparcv9/sem_open.c: New file.
* sysdeps/sparc/sparc32/sparcv9/sem_post.c: New file.
* sysdeps/sparc/sparc32/sparcv9/sem_waitcommon.c: New file.
* sysdeps/sparc/sparc32/sparcv9/sem_wait.c: Redirect to nptl
version.
* sysdeps/sparc/sparc32/sparcv9/sem_timedwait.c: Delete.
* sysdeps/sparc/sparc32/sparcv9/sem_trywait.c: Delete.
+2015-01-31 David S. Miller <davem@davemloft.net>
+
+ * sysdeps/sparc/nptl/sem_init.c: Delete.
+ * sysdeps/sparc/nptl/sem_post.c: Delete.
+ * sysdeps/sparc/nptl/sem_timedwait.c: Delete.
+ * sysdeps/sparc/nptl/sem_wait.c: Delete.
+ * sysdeps/sparc/sparc32/sem_init.c: New file.
+ * sysdeps/sparc/sparc32/sem_waitcommon.c: New file.
+ * sysdeps/sparc/sparc32/sem_open.c: Generic nptl version with
+ padding explicitly initialized.
+ * sysdeps/sparc/sparc32/sem_post.c: Generic nptl version using
+ padding for in-semaphore spinlock.
+ * sysdeps/sparc/sparc32/sem_wait.c: Likewise.
+ * sysdeps/sparc/sparc32/sem_trywait.c: Delete.
+ * sysdeps/sparc/sparc32/sem_timedwait.c: Delete.
+ * sysdeps/sparc/sparc32/sparcv9/sem_init.c: New file.
+ * sysdeps/sparc/sparc32/sparcv9/sem_open.c: New file.
+ * sysdeps/sparc/sparc32/sparcv9/sem_post.c: New file.
+ * sysdeps/sparc/sparc32/sparcv9/sem_waitcommon.c: New file.
+ * sysdeps/sparc/sparc32/sparcv9/sem_wait.c: Redirect to nptl
+ version.
+ * sysdeps/sparc/sparc32/sparcv9/sem_timedwait.c: Delete.
+ * sysdeps/sparc/sparc32/sparcv9/sem_trywait.c: Delete.
+
2015-01-30 H.J. Lu <hongjiu.lu@intel.com>
[BZ #17801]
+++ /dev/null
-/* sem_post -- post to a POSIX semaphore. SPARC version.
- Copyright (C) 2003-2015 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#include <errno.h>
-#include <sysdep.h>
-#include <lowlevellock.h>
-#include <internaltypes.h>
-#include <semaphore.h>
-
-#include <shlib-compat.h>
-#include <sparc-nptl.h>
-
-int
-__new_sem_post (sem_t *sem)
-{
- struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
-
- atomic_increment (&isem->value);
- atomic_full_barrier ();
- if (isem->nwaiters > 0)
- {
- int err = lll_futex_wake (&isem->value, 1,
- isem->private ^ FUTEX_PRIVATE_FLAG);
- if (__builtin_expect (err, 0) < 0)
- {
- __set_errno (-err);
- return -1;
- }
- }
- return 0;
-}
-versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1);
-
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
-int
-attribute_compat_text_section
-__old_sem_post (sem_t *sem)
-{
- struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
- int err;
-
- atomic_increment (&isem->value);
- err = lll_futex_wake (&isem->value, 1,
- isem->private ^ FUTEX_PRIVATE_FLAG);
- if (__builtin_expect (err, 0) < 0)
- {
- __set_errno (-err);
- return -1;
- }
- return 0;
-}
-compat_symbol (libpthread, __old_sem_post, sem_post, GLIBC_2_0);
-#endif
+++ /dev/null
-/* sem_timedwait -- wait on a semaphore. Generic futex-using version.
- Copyright (C) 2003-2015 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#include <errno.h>
-#include <sysdep.h>
-#include <lowlevellock.h>
-#include <internaltypes.h>
-#include <semaphore.h>
-
-#include <pthreadP.h>
-#include <shlib-compat.h>
-#include <sparc-nptl.h>
-
-extern void __sem_wait_cleanup (void *arg) attribute_hidden;
-
-/* This is in a seperate function in order to make sure gcc
- puts the call site into an exception region, and thus the
- cleanups get properly run. */
-static int
-__attribute__ ((noinline))
-do_futex_timed_wait (struct sparc_new_sem *isem, struct timespec *rt)
-{
- int err, oldtype = __pthread_enable_asynccancel ();
-
- err = lll_futex_timed_wait (&isem->value, 0, rt,
- isem->private ^ FUTEX_PRIVATE_FLAG);
-
- __pthread_disable_asynccancel (oldtype);
- return err;
-}
-
-int
-sem_timedwait (sem_t *sem, const struct timespec *abstime)
-{
- struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
- int err;
-
- if (atomic_decrement_if_positive (&isem->value) > 0)
- return 0;
-
- if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
- {
- __set_errno (EINVAL);
- return -1;
- }
-
- atomic_increment (&isem->nwaiters);
-
- pthread_cleanup_push (__sem_wait_cleanup, isem);
-
- while (1)
- {
- struct timeval tv;
- struct timespec rt;
- int sec, nsec;
-
- /* Get the current time. */
- __gettimeofday (&tv, NULL);
-
- /* Compute relative timeout. */
- sec = abstime->tv_sec - tv.tv_sec;
- nsec = abstime->tv_nsec - tv.tv_usec * 1000;
- if (nsec < 0)
- {
- nsec += 1000000000;
- --sec;
- }
-
- /* Already timed out? */
- if (sec < 0)
- {
- __set_errno (ETIMEDOUT);
- err = -1;
- break;
- }
-
- /* Do wait. */
- rt.tv_sec = sec;
- rt.tv_nsec = nsec;
- err = do_futex_timed_wait(isem, &rt);
- if (err != 0 && err != -EWOULDBLOCK)
- {
- __set_errno (-err);
- err = -1;
- break;
- }
-
- if (atomic_decrement_if_positive (&isem->value) > 0)
- {
- err = 0;
- break;
- }
- }
-
- pthread_cleanup_pop (0);
-
- atomic_decrement (&isem->nwaiters);
-
- return err;
-}
+++ /dev/null
-/* sem_wait -- wait on a semaphore. Generic futex-using version.
- Copyright (C) 2003-2015 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#include <errno.h>
-#include <sysdep.h>
-#include <lowlevellock.h>
-#include <internaltypes.h>
-#include <semaphore.h>
-
-#include <pthreadP.h>
-#include <shlib-compat.h>
-#include <sparc-nptl.h>
-
-void
-attribute_hidden
-__sem_wait_cleanup (void *arg)
-{
- struct sparc_new_sem *isem = (struct sparc_new_sem *) arg;
-
- atomic_decrement (&isem->nwaiters);
-}
-
-/* This is in a seperate function in order to make sure gcc
- puts the call site into an exception region, and thus the
- cleanups get properly run. */
-static int
-__attribute__ ((noinline))
-do_futex_wait (struct sparc_new_sem *isem)
-{
- int err, oldtype = __pthread_enable_asynccancel ();
-
- err = lll_futex_wait (&isem->value, 0, isem->private ^ FUTEX_PRIVATE_FLAG);
-
- __pthread_disable_asynccancel (oldtype);
- return err;
-}
-
-int
-__new_sem_wait (sem_t *sem)
-{
- struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
- int err;
-
- if (atomic_decrement_if_positive (&isem->value) > 0)
- return 0;
-
- atomic_increment (&isem->nwaiters);
-
- pthread_cleanup_push (__sem_wait_cleanup, isem);
-
- while (1)
- {
- err = do_futex_wait(isem);
- if (err != 0 && err != -EWOULDBLOCK)
- {
- __set_errno (-err);
- err = -1;
- break;
- }
-
- if (atomic_decrement_if_positive (&isem->value) > 0)
- {
- err = 0;
- break;
- }
- }
-
- pthread_cleanup_pop (0);
-
- atomic_decrement (&isem->nwaiters);
-
- return err;
-}
-versioned_symbol (libpthread, __new_sem_wait, sem_wait, GLIBC_2_1);
-
-
-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
-int
-attribute_compat_text_section
-__old_sem_wait (sem_t *sem)
-{
- struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
- int err;
-
- do
- {
- if (atomic_decrement_if_positive (&isem->value) > 0)
- return 0;
-
- /* Enable asynchronous cancellation. Required by the standard. */
- int oldtype = __pthread_enable_asynccancel ();
-
- err = lll_futex_wait (&isem->value, 0,
- isem->private ^ FUTEX_PRIVATE_FLAG);
-
- /* Disable asynchronous cancellation. */
- __pthread_disable_asynccancel (oldtype);
- }
- while (err == 0 || err == -EWOULDBLOCK);
-
- __set_errno (-err);
- return -1;
-}
-
-compat_symbol (libpthread, __old_sem_wait, sem_wait, GLIBC_2_0);
-#endif
<http://www.gnu.org/licenses/>. */
#include <errno.h>
-#include <string.h>
#include <semaphore.h>
-#include <lowlevellock.h>
#include <shlib-compat.h>
#include "semaphoreP.h"
#include <kernel-features.h>
-#include <sparc-nptl.h>
+
+/* Returns FUTEX_PRIVATE if pshared is zero and private futexes are supported;
+ returns FUTEX_SHARED otherwise.
+ TODO Remove when cleaning up the futex API throughout glibc. */
+static __always_inline int
+futex_private_if_supported (int pshared)
+{
+ if (pshared != 0)
+ return LLL_SHARED;
+#ifdef __ASSUME_PRIVATE_FUTEX
+ return LLL_PRIVATE;
+#else
+ return THREAD_GETMEM (THREAD_SELF, header.private_futex)
+ ^ FUTEX_PRIVATE_FLAG;
+#endif
+}
+
int
-__new_sem_init (sem, pshared, value)
- sem_t *sem;
- int pshared;
- unsigned int value;
+__new_sem_init (sem_t *sem, int pshared, unsigned int value)
{
/* Parameter sanity check. */
if (__glibc_unlikely (value > SEM_VALUE_MAX))
}
/* Map to the internal type. */
- struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
+ struct new_sem *isem = (struct new_sem *) sem;
- /* Use the values the user provided. */
- memset (isem, '\0', sizeof (*isem));
- isem->value = value;
-#ifdef __ASSUME_PRIVATE_FUTEX
- isem->private = pshared ? 0 : FUTEX_PRIVATE_FLAG;
-#else
- isem->private = pshared ? 0 : THREAD_GETMEM (THREAD_SELF,
- header.private_futex);
-#endif
+ /* Use the values the caller provided. */
+ isem->value = value << SEM_VALUE_SHIFT;
+ isem->pad = 0;
+ isem->nwaiters = 0;
+
+ isem->private = futex_private_if_supported (pshared);
return 0;
}
}
/* Map to the internal type. */
- struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
+ struct old_sem *isem = (struct old_sem *) sem;
/* Use the value the user provided. */
- memset (isem, '\0', sizeof (*isem));
isem->value = value;
-#ifdef __ASSUME_PRIVATE_FUTEX
- isem->private = pshared ? 0 : FUTEX_PRIVATE_FLAG;
-#else
- isem->private = pshared ? 0 : THREAD_GETMEM (THREAD_SELF,
- header.private_futex);
-#endif
+ /* We cannot store the PSHARED attribute. So we always use the
+ operations needed for shared semaphores. */
return 0;
}
--- /dev/null
+/* Copyright (C) 2002-2015 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <search.h>
+#include <semaphore.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <sys/stat.h>
+#include "semaphoreP.h"
+#include <shm-directory.h>
+
+
+/* Comparison function for search of existing mapping. */
+int
+attribute_hidden
+__sem_search (const void *a, const void *b)
+{
+ const struct inuse_sem *as = (const struct inuse_sem *) a;
+ const struct inuse_sem *bs = (const struct inuse_sem *) b;
+
+ if (as->ino != bs->ino)
+ /* Cannot return the difference the type is larger than int. */
+ return as->ino < bs->ino ? -1 : (as->ino == bs->ino ? 0 : 1);
+
+ if (as->dev != bs->dev)
+ /* Cannot return the difference the type is larger than int. */
+ return as->dev < bs->dev ? -1 : (as->dev == bs->dev ? 0 : 1);
+
+ return strcmp (as->name, bs->name);
+}
+
+
+/* The search tree for existing mappings. */
+void *__sem_mappings attribute_hidden;
+
+/* Lock to protect the search tree. */
+int __sem_mappings_lock attribute_hidden = LLL_LOCK_INITIALIZER;
+
+
+/* Search for existing mapping and if possible add the one provided. */
+static sem_t *
+check_add_mapping (const char *name, size_t namelen, int fd, sem_t *existing)
+{
+ sem_t *result = SEM_FAILED;
+
+ /* Get the information about the file. */
+ struct stat64 st;
+ if (__fxstat64 (_STAT_VER, fd, &st) == 0)
+ {
+ /* Get the lock. */
+ lll_lock (__sem_mappings_lock, LLL_PRIVATE);
+
+ /* Search for an existing mapping given the information we have. */
+ struct inuse_sem *fake;
+ fake = (struct inuse_sem *) alloca (sizeof (*fake) + namelen);
+ memcpy (fake->name, name, namelen);
+ fake->dev = st.st_dev;
+ fake->ino = st.st_ino;
+
+ struct inuse_sem **foundp = tfind (fake, &__sem_mappings, __sem_search);
+ if (foundp != NULL)
+ {
+ /* There is already a mapping. Use it. */
+ result = (*foundp)->sem;
+ ++(*foundp)->refcnt;
+ }
+ else
+ {
+ /* We haven't found a mapping. Install ione. */
+ struct inuse_sem *newp;
+
+ newp = (struct inuse_sem *) malloc (sizeof (*newp) + namelen);
+ if (newp != NULL)
+ {
+ /* If the caller hasn't provided any map it now. */
+ if (existing == SEM_FAILED)
+ existing = (sem_t *) mmap (NULL, sizeof (sem_t),
+ PROT_READ | PROT_WRITE, MAP_SHARED,
+ fd, 0);
+
+ newp->dev = st.st_dev;
+ newp->ino = st.st_ino;
+ newp->refcnt = 1;
+ newp->sem = existing;
+ memcpy (newp->name, name, namelen);
+
+ /* Insert the new value. */
+ if (existing != MAP_FAILED
+ && tsearch (newp, &__sem_mappings, __sem_search) != NULL)
+ /* Successful. */
+ result = existing;
+ else
+ /* Something went wrong while inserting the new
+ value. We fail completely. */
+ free (newp);
+ }
+ }
+
+ /* Release the lock. */
+ lll_unlock (__sem_mappings_lock, LLL_PRIVATE);
+ }
+
+ if (result != existing && existing != SEM_FAILED && existing != MAP_FAILED)
+ {
+ /* Do not disturb errno. */
+ int save = errno;
+ munmap (existing, sizeof (sem_t));
+ errno = save;
+ }
+
+ return result;
+}
+
+
+sem_t *
+sem_open (const char *name, int oflag, ...)
+{
+ int fd;
+ sem_t *result;
+
+ /* Create the name of the final file in local variable SHM_NAME. */
+ SHM_GET_NAME (EINVAL, SEM_FAILED, SEM_SHM_PREFIX);
+
+ /* If the semaphore object has to exist simply open it. */
+ if ((oflag & O_CREAT) == 0 || (oflag & O_EXCL) == 0)
+ {
+ try_again:
+ fd = __libc_open (shm_name,
+ (oflag & ~(O_CREAT|O_ACCMODE)) | O_NOFOLLOW | O_RDWR);
+
+ if (fd == -1)
+ {
+ /* If we are supposed to create the file try this next. */
+ if ((oflag & O_CREAT) != 0 && errno == ENOENT)
+ goto try_create;
+
+ /* Return. errno is already set. */
+ }
+ else
+ /* Check whether we already have this semaphore mapped and
+ create one if necessary. */
+ result = check_add_mapping (name, namelen, fd, SEM_FAILED);
+ }
+ else
+ {
+ /* We have to open a temporary file first since it must have the
+ correct form before we can start using it. */
+ char *tmpfname;
+ mode_t mode;
+ unsigned int value;
+ va_list ap;
+
+ try_create:
+ va_start (ap, oflag);
+
+ mode = va_arg (ap, mode_t);
+ value = va_arg (ap, unsigned int);
+
+ va_end (ap);
+
+ if (value > SEM_VALUE_MAX)
+ {
+ __set_errno (EINVAL);
+ return SEM_FAILED;
+ }
+
+ /* Create the initial file content. */
+ union
+ {
+ sem_t initsem;
+ struct new_sem newsem;
+ } sem;
+
+ sem.newsem.value = value << SEM_VALUE_SHIFT;
+ sem.newsem.pad = 0;
+ sem.newsem.nwaiters = 0;
+
+ /* This always is a shared semaphore. */
+ sem.newsem.private = LLL_SHARED;
+
+ /* Initialize the remaining bytes as well. */
+ memset ((char *) &sem.initsem + sizeof (struct new_sem), '\0',
+ sizeof (sem_t) - sizeof (struct new_sem));
+
+ tmpfname = __alloca (shm_dirlen + sizeof SEM_SHM_PREFIX + 6);
+ char *xxxxxx = __mempcpy (tmpfname, shm_dir, shm_dirlen);
+
+ int retries = 0;
+#define NRETRIES 50
+ while (1)
+ {
+ /* Add the suffix for mktemp. */
+ strcpy (xxxxxx, "XXXXXX");
+
+ /* We really want to use mktemp here. We cannot use mkstemp
+ since the file must be opened with a specific mode. The
+ mode cannot later be set since then we cannot apply the
+ file create mask. */
+ if (__mktemp (tmpfname) == NULL)
+ return SEM_FAILED;
+
+ /* Open the file. Make sure we do not overwrite anything. */
+ fd = __libc_open (tmpfname, O_RDWR | O_CREAT | O_EXCL, mode);
+ if (fd == -1)
+ {
+ if (errno == EEXIST)
+ {
+ if (++retries < NRETRIES)
+ continue;
+
+ __set_errno (EAGAIN);
+ }
+
+ return SEM_FAILED;
+ }
+
+ /* We got a file. */
+ break;
+ }
+
+ if (TEMP_FAILURE_RETRY (__libc_write (fd, &sem.initsem, sizeof (sem_t)))
+ == sizeof (sem_t)
+ /* Map the sem_t structure from the file. */
+ && (result = (sem_t *) mmap (NULL, sizeof (sem_t),
+ PROT_READ | PROT_WRITE, MAP_SHARED,
+ fd, 0)) != MAP_FAILED)
+ {
+ /* Create the file. Don't overwrite an existing file. */
+ if (link (tmpfname, shm_name) != 0)
+ {
+ /* Undo the mapping. */
+ (void) munmap (result, sizeof (sem_t));
+
+ /* Reinitialize 'result'. */
+ result = SEM_FAILED;
+
+ /* This failed. If O_EXCL is not set and the problem was
+ that the file exists, try again. */
+ if ((oflag & O_EXCL) == 0 && errno == EEXIST)
+ {
+ /* Remove the file. */
+ (void) unlink (tmpfname);
+
+ /* Close the file. */
+ (void) __libc_close (fd);
+
+ goto try_again;
+ }
+ }
+ else
+ /* Insert the mapping into the search tree. This also
+ determines whether another thread sneaked by and already
+ added such a mapping despite the fact that we created it. */
+ result = check_add_mapping (name, namelen, fd, result);
+ }
+
+ /* Now remove the temporary name. This should never fail. If
+ it fails we leak a file name. Better fix the kernel. */
+ (void) unlink (tmpfname);
+ }
+
+ /* Map the mmap error to the error we need. */
+ if (MAP_FAILED != (void *) SEM_FAILED && result == MAP_FAILED)
+ result = SEM_FAILED;
+
+ /* We don't need the file descriptor anymore. */
+ if (fd != -1)
+ {
+ /* Do not disturb errno. */
+ int save = errno;
+ __libc_close (fd);
+ errno = save;
+ }
+
+ return result;
+}
-/* sem_post -- post to a POSIX semaphore. SPARC version.
+/* sem_post -- post to a POSIX semaphore. Generic futex-using version.
Copyright (C) 2003-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
+#include <atomic.h>
#include <errno.h>
#include <sysdep.h>
#include <lowlevellock.h>
#include <semaphore.h>
#include <shlib-compat.h>
-#include <sparc-nptl.h>
+/* Wrapper for lll_futex_wake, with error checking.
+ TODO Remove when cleaning up the futex API throughout glibc. */
+static __always_inline void
+futex_wake (unsigned int* futex, int processes_to_wake, int private)
+{
+ int res = lll_futex_wake (futex, processes_to_wake, private);
+ /* No error. Ignore the number of woken processes. */
+ if (res >= 0)
+ return;
+ switch (res)
+ {
+ case -EFAULT: /* Could have happened due to memory reuse. */
+ case -EINVAL: /* Could be either due to incorrect alignment (a bug in
+ glibc or in the application) or due to memory being
+ reused for a PI futex. We cannot distinguish between the
+ two causes, and one of them is correct use, so we do not
+ act in this case. */
+ return;
+ case -ENOSYS: /* Must have been caused by a glibc bug. */
+ /* No other errors are documented at this time. */
+ default:
+ abort ();
+ }
+}
+
+
+/* See sem_wait for an explanation of the algorithm. */
int
__new_sem_post (sem_t *sem)
{
- struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
- int nr;
+ struct new_sem *isem = (struct new_sem *) sem;
+ int private = isem->private;
+ unsigned int v;
- if (__atomic_is_v9)
- nr = atomic_increment_val (&isem->value);
- else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- nr = ++(isem->value);
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
- atomic_full_barrier ();
- if (isem->nwaiters > 0)
+ __sparc32_atomic_do_lock24(&isem->pad);
+
+ v = isem->value;
+ if ((v << SEM_VALUE_SHIFT) == SEM_VALUE_MAX)
{
- int err = lll_futex_wake (&isem->value, 1,
- isem->private ^ FUTEX_PRIVATE_FLAG);
- if (__builtin_expect (err, 0) < 0)
- {
- __set_errno (-err);
- return -1;
- }
+ __sparc32_atomic_do_unlock24(&isem->pad);
+
+ __set_errno (EOVERFLOW);
+ return -1;
}
+ isem->value = v + (1 << SEM_VALUE_SHIFT);
+
+ __sparc32_atomic_do_unlock24(&isem->pad);
+
+ if ((v & SEM_NWAITERS_MASK) != 0)
+ futex_wake (&isem->value, 1, private);
+
return 0;
}
versioned_symbol (libpthread, __new_sem_post, sem_post, GLIBC_2_1);
attribute_compat_text_section
__old_sem_post (sem_t *sem)
{
- struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
- int nr;
+ int *futex = (int *) sem;
- if (__atomic_is_v9)
- nr = atomic_increment_val (&isem->value);
- else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- nr = ++(isem->value);
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
- int err = lll_futex_wake (&isem->value, 1,
- isem->private ^ FUTEX_PRIVATE_FLAG);
+ /* We must need to synchronize with consumers of this token, so the atomic
+ increment must have release MO semantics. */
+ atomic_write_barrier ();
+ (void) atomic_increment_val (futex);
+ /* We always have to assume it is a shared semaphore. */
+ int err = lll_futex_wake (futex, 1, LLL_SHARED);
if (__builtin_expect (err, 0) < 0)
{
__set_errno (-err);
+++ /dev/null
-/* sem_timedwait -- wait on a semaphore. SPARC version.
- Copyright (C) 2003-2015 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#include <errno.h>
-#include <sysdep.h>
-#include <lowlevellock.h>
-#include <internaltypes.h>
-#include <semaphore.h>
-
-#include <pthreadP.h>
-#include <shlib-compat.h>
-#include <sparc-nptl.h>
-
-extern void __sem_wait_cleanup (void *arg) attribute_hidden;
-
-/* This is in a seperate function in order to make sure gcc
- puts the call site into an exception region, and thus the
- cleanups get properly run. */
-static int
-__attribute__ ((noinline))
-do_futex_timed_wait (struct sparc_new_sem *isem, struct timespec *rt)
-{
- int err, oldtype = __pthread_enable_asynccancel ();
-
- err = lll_futex_timed_wait (&isem->value, 0, rt,
- isem->private ^ FUTEX_PRIVATE_FLAG);
-
- __pthread_disable_asynccancel (oldtype);
- return err;
-}
-
-int
-sem_timedwait (sem_t *sem, const struct timespec *abstime)
-{
- struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
- int err;
- int val;
-
- if (__atomic_is_v9)
- val = atomic_decrement_if_positive (&isem->value);
- else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- val = isem->value;
- if (val > 0)
- isem->value = val - 1;
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
-
- if (val > 0)
- return 0;
-
- if (abstime->tv_nsec < 0 || abstime->tv_nsec >= 1000000000)
- {
- __set_errno (EINVAL);
- return -1;
- }
-
- if (__atomic_is_v9)
- atomic_increment (&isem->nwaiters);
- else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- isem->nwaiters++;
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
-
- pthread_cleanup_push (__sem_wait_cleanup, isem);
-
- while (1)
- {
- struct timeval tv;
- struct timespec rt;
- int sec, nsec;
-
- /* Get the current time. */
- __gettimeofday (&tv, NULL);
-
- /* Compute relative timeout. */
- sec = abstime->tv_sec - tv.tv_sec;
- nsec = abstime->tv_nsec - tv.tv_usec * 1000;
- if (nsec < 0)
- {
- nsec += 1000000000;
- --sec;
- }
-
- /* Already timed out? */
- if (sec < 0)
- {
- __set_errno (ETIMEDOUT);
- err = -1;
- break;
- }
-
- /* Do wait. */
- rt.tv_sec = sec;
- rt.tv_nsec = nsec;
- err = do_futex_timed_wait(isem, &rt);
- if (err != 0 && err != -EWOULDBLOCK)
- {
- __set_errno (-err);
- err = -1;
- break;
- }
-
- if (__atomic_is_v9)
- val = atomic_decrement_if_positive (&isem->value);
- else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- val = isem->value;
- if (val > 0)
- isem->value = val - 1;
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
-
- if (val > 0)
- {
- err = 0;
- break;
- }
- }
-
- pthread_cleanup_pop (0);
-
- if (__atomic_is_v9)
- atomic_decrement (&isem->nwaiters);
- else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- isem->nwaiters--;
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
-
- return err;
-}
+++ /dev/null
-/* sem_trywait -- wait on a semaphore. SPARC version.
- Copyright (C) 2003-2015 Free Software Foundation, Inc.
- This file is part of the GNU C Library.
- Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with the GNU C Library; if not, see
- <http://www.gnu.org/licenses/>. */
-
-#include <errno.h>
-#include <sysdep.h>
-#include <lowlevellock.h>
-#include <internaltypes.h>
-#include <semaphore.h>
-
-#include <shlib-compat.h>
-
-
-int
-__new_sem_trywait (sem_t *sem)
-{
- struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
- int val;
-
- if (isem->value > 0)
- {
- if (__atomic_is_v9)
- val = atomic_decrement_if_positive (&isem->value);
- else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- val = isem->value;
- if (val > 0)
- isem->value = val - 1;
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
- if (val > 0)
- return 0;
- }
-
- __set_errno (EAGAIN);
- return -1;
-}
-versioned_symbol (libpthread, __new_sem_trywait, sem_trywait, GLIBC_2_1);
-#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
-strong_alias (__new_sem_trywait, __old_sem_trywait)
-compat_symbol (libpthread, __old_sem_trywait, sem_trywait, GLIBC_2_0);
-#endif
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
-#include <errno.h>
-#include <sysdep.h>
-#include <lowlevellock.h>
-#include <internaltypes.h>
-#include <semaphore.h>
-
-#include <pthreadP.h>
-#include <shlib-compat.h>
-#include <sparc-nptl.h>
-
-void
-attribute_hidden
-__sem_wait_cleanup (void *arg)
-{
- struct sparc_new_sem *isem = (struct sparc_new_sem *) arg;
-
- if (__atomic_is_v9)
- atomic_decrement (&isem->nwaiters);
- else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- isem->nwaiters--;
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
-}
-
-/* This is in a seperate function in order to make sure gcc
- puts the call site into an exception region, and thus the
- cleanups get properly run. */
-static int
-__attribute__ ((noinline))
-do_futex_wait (struct sparc_new_sem *isem)
-{
- int err, oldtype = __pthread_enable_asynccancel ();
-
- err = lll_futex_wait (&isem->value, 0, isem->private ^ FUTEX_PRIVATE_FLAG);
-
- __pthread_disable_asynccancel (oldtype);
- return err;
-}
+#include "sem_waitcommon.c"
int
__new_sem_wait (sem_t *sem)
{
- struct sparc_new_sem *isem = (struct sparc_new_sem *) sem;
- int err;
- int val;
-
- if (__atomic_is_v9)
- val = atomic_decrement_if_positive (&isem->value);
- else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- val = isem->value;
- if (val > 0)
- isem->value = val - 1;
- else
- isem->nwaiters++;
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
-
- if (val > 0)
+ if (__new_sem_wait_fast ((struct new_sem *) sem, 0) == 0)
return 0;
-
- if (__atomic_is_v9)
- atomic_increment (&isem->nwaiters);
- else
- /* Already done above while still holding isem->lock. */;
-
- pthread_cleanup_push (__sem_wait_cleanup, isem);
-
- while (1)
- {
- err = do_futex_wait(isem);
- if (err != 0 && err != -EWOULDBLOCK)
- {
- __set_errno (-err);
- err = -1;
- break;
- }
-
- if (__atomic_is_v9)
- val = atomic_decrement_if_positive (&isem->value);
- else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- val = isem->value;
- if (val > 0)
- isem->value = val - 1;
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
-
- if (val > 0)
- {
- err = 0;
- break;
- }
- }
-
- pthread_cleanup_pop (0);
-
- if (__atomic_is_v9)
- atomic_decrement (&isem->nwaiters);
else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- isem->nwaiters--;
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
-
- return err;
+ return __new_sem_wait_slow((struct new_sem *) sem, NULL);
}
versioned_symbol (libpthread, __new_sem_wait, sem_wait, GLIBC_2_1);
-
#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
int
attribute_compat_text_section
__old_sem_wait (sem_t *sem)
{
- struct sparc_old_sem *isem = (struct sparc_old_sem *) sem;
+ int *futex = (int *) sem;
int err;
- int val;
do
{
- if (__atomic_is_v9)
- val = atomic_decrement_if_positive (&isem->value);
- else
- {
- __sparc32_atomic_do_lock24 (&isem->lock);
- val = isem->value;
- if (val > 0)
- isem->value = val - 1;
- __sparc32_atomic_do_unlock24 (&isem->lock);
- }
-
- if (val > 0)
+ if (atomic_decrement_if_positive (futex) > 0)
return 0;
/* Enable asynchronous cancellation. Required by the standard. */
int oldtype = __pthread_enable_asynccancel ();
- err = lll_futex_wait (&isem->value, 0,
- isem->private ^ FUTEX_PRIVATE_FLAG);
+ /* Always assume the semaphore is shared. */
+ err = lll_futex_wait (futex, 0, LLL_SHARED);
/* Disable asynchronous cancellation. */
__pthread_disable_asynccancel (oldtype);
compat_symbol (libpthread, __old_sem_wait, sem_wait, GLIBC_2_0);
#endif
+
+int
+__new_sem_trywait (sem_t *sem)
+{
+ /* We must not fail spuriously, so require a definitive result even if this
+ may lead to a long execution time. */
+ if (__new_sem_wait_fast ((struct new_sem *) sem, 1) == 0)
+ return 0;
+ __set_errno (EAGAIN);
+ return -1;
+}
+versioned_symbol (libpthread, __new_sem_trywait, sem_trywait, GLIBC_2_1);
+#if SHLIB_COMPAT (libpthread, GLIBC_2_0, GLIBC_2_1)
+int
+__old_sem_trywait (sem_t *sem)
+{
+ int *futex = (int *) sem;
+ int val;
+
+ if (*futex > 0)
+ {
+ val = atomic_decrement_if_positive (futex);
+ if (val > 0)
+ return 0;
+ }
+
+ __set_errno (EAGAIN);
+ return -1;
+}
+compat_symbol (libpthread, __old_sem_trywait, sem_trywait, GLIBC_2_0);
+#endif
--- /dev/null
+/* sem_waitcommon -- wait on a semaphore, shared code.
+ Copyright (C) 2003-2015 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Lesser General Public License for more details.
+
+ You should have received a copy of the GNU Lesser General Public
+ License along with the GNU C Library; if not, see
+ <http://www.gnu.org/licenses/>. */
+
+#include <errno.h>
+#include <sysdep.h>
+#include <lowlevellock.h>
+#include <internaltypes.h>
+#include <semaphore.h>
+#include <sys/time.h>
+
+#include <pthreadP.h>
+#include <shlib-compat.h>
+#include <atomic.h>
+
+/* Wrapper for lll_futex_wait with absolute timeout and error checking.
+ TODO Remove when cleaning up the futex API throughout glibc. */
+static __always_inline int
+futex_abstimed_wait (unsigned int* futex, unsigned int expected,
+ const struct timespec* abstime, int private, bool cancel)
+{
+ int err, oldtype;
+ if (abstime == NULL)
+ {
+ if (cancel)
+ oldtype = __pthread_enable_asynccancel ();
+ err = lll_futex_wait (futex, expected, private);
+ if (cancel)
+ __pthread_disable_asynccancel (oldtype);
+ }
+ else
+ {
+ struct timeval tv;
+ struct timespec rt;
+ int sec, nsec;
+
+ /* Get the current time. */
+ __gettimeofday (&tv, NULL);
+
+ /* Compute relative timeout. */
+ sec = abstime->tv_sec - tv.tv_sec;
+ nsec = abstime->tv_nsec - tv.tv_usec * 1000;
+ if (nsec < 0)
+ {
+ nsec += 1000000000;
+ --sec;
+ }
+
+ /* Already timed out? */
+ if (sec < 0)
+ return ETIMEDOUT;
+
+ /* Do wait. */
+ rt.tv_sec = sec;
+ rt.tv_nsec = nsec;
+ if (cancel)
+ oldtype = __pthread_enable_asynccancel ();
+ err = lll_futex_timed_wait (futex, expected, &rt, private);
+ if (cancel)
+ __pthread_disable_asynccancel (oldtype);
+ }
+ switch (err)
+ {
+ case 0:
+ case -EAGAIN:
+ case -EINTR:
+ case -ETIMEDOUT:
+ return -err;
+
+ case -EFAULT: /* Must have been caused by a glibc or application bug. */
+ case -EINVAL: /* Either due to wrong alignment or due to the timeout not
+ being normalized. Must have been caused by a glibc or
+ application bug. */
+ case -ENOSYS: /* Must have been caused by a glibc bug. */
+ /* No other errors are documented at this time. */
+ default:
+ abort ();
+ }
+}
+
+/* Wrapper for lll_futex_wake, with error checking.
+ TODO Remove when cleaning up the futex API throughout glibc. */
+static __always_inline void
+futex_wake (unsigned int* futex, int processes_to_wake, int private)
+{
+ int res = lll_futex_wake (futex, processes_to_wake, private);
+ /* No error. Ignore the number of woken processes. */
+ if (res >= 0)
+ return;
+ switch (res)
+ {
+ case -EFAULT: /* Could have happened due to memory reuse. */
+ case -EINVAL: /* Could be either due to incorrect alignment (a bug in
+ glibc or in the application) or due to memory being
+ reused for a PI futex. We cannot distinguish between the
+ two causes, and one of them is correct use, so we do not
+ act in this case. */
+ return;
+ case -ENOSYS: /* Must have been caused by a glibc bug. */
+ /* No other errors are documented at this time. */
+ default:
+ abort ();
+ }
+}
+
+
+/* Set this to true if you assume that, in contrast to current Linux futex
+ documentation, lll_futex_wake can return -EINTR only if interrupted by a
+ signal, not spuriously due to some other reason.
+ TODO Discuss EINTR conditions with the Linux kernel community. For
+ now, we set this to true to not change behavior of semaphores compared
+ to previous glibc builds. */
+static const int sem_assume_only_signals_cause_futex_EINTR = 1;
+
+static void
+__sem_wait_32_finish (struct new_sem *sem);
+
+static void
+__sem_wait_cleanup (void *arg)
+{
+ struct new_sem *sem = (struct new_sem *) arg;
+
+ __sem_wait_32_finish (sem);
+}
+
+/* Wait until at least one token is available, possibly with a timeout.
+ This is in a separate function in order to make sure gcc
+ puts the call site into an exception region, and thus the
+ cleanups get properly run. TODO still necessary? Other futex_wait
+ users don't seem to need it. */
+static int
+__attribute__ ((noinline))
+do_futex_wait (struct new_sem *sem, const struct timespec *abstime)
+{
+ int err;
+
+ err = futex_abstimed_wait (&sem->value, SEM_NWAITERS_MASK, abstime,
+ sem->private, true);
+
+ return err;
+}
+
+/* Fast path: Try to grab a token without blocking. */
+static int
+__new_sem_wait_fast (struct new_sem *sem, int definitive_result)
+{
+ unsigned int v;
+ int ret = 0;
+
+ __sparc32_atomic_do_lock24(&sem->pad);
+
+ v = sem->value;
+ if ((v >> SEM_VALUE_SHIFT) == 0)
+ ret = -1;
+ else
+ sem->value = v - (1 << SEM_VALUE_SHIFT);
+
+ __sparc32_atomic_do_unlock24(&sem->pad);
+
+ return ret;
+}
+
+/* Slow path that blocks. */
+static int
+__attribute__ ((noinline))
+__new_sem_wait_slow (struct new_sem *sem, const struct timespec *abstime)
+{
+ unsigned int v;
+ int err = 0;
+
+ __sparc32_atomic_do_lock24(&sem->pad);
+
+ sem->nwaiters++;
+
+ pthread_cleanup_push (__sem_wait_cleanup, sem);
+
+ /* Wait for a token to be available. Retry until we can grab one. */
+ v = sem->value;
+ do
+ {
+ if (!(v & SEM_NWAITERS_MASK))
+ sem->value = v | SEM_NWAITERS_MASK;
+
+ /* If there is no token, wait. */
+ if ((v >> SEM_VALUE_SHIFT) == 0)
+ {
+ __sparc32_atomic_do_unlock24(&sem->pad);
+
+ err = do_futex_wait(sem, abstime);
+ if (err == ETIMEDOUT ||
+ (err == EINTR && sem_assume_only_signals_cause_futex_EINTR))
+ {
+ __set_errno (err);
+ err = -1;
+ goto error;
+ }
+ err = 0;
+
+ __sparc32_atomic_do_lock24(&sem->pad);
+
+ /* We blocked, so there might be a token now. */
+ v = sem->value;
+ }
+ }
+ /* If there is no token, we must not try to grab one. */
+ while ((v >> SEM_VALUE_SHIFT) == 0);
+
+ sem->value = v - (1 << SEM_VALUE_SHIFT);
+
+ __sparc32_atomic_do_unlock24(&sem->pad);
+
+error:
+ pthread_cleanup_pop (0);
+
+ __sem_wait_32_finish (sem);
+
+ return err;
+}
+
+/* Stop being a registered waiter (non-64b-atomics code only). */
+static void
+__sem_wait_32_finish (struct new_sem *sem)
+{
+ __sparc32_atomic_do_lock24(&sem->pad);
+
+ if (--sem->nwaiters == 0)
+ sem->value &= ~SEM_NWAITERS_MASK;
+
+ __sparc32_atomic_do_unlock24(&sem->pad);
+}
--- /dev/null
+#include <nptl/sem_init.c>
--- /dev/null
+#include <nptl/sem_open.c>
-#include <sysdeps/sparc/nptl/sem_post.c>
+#include <nptl/sem_post.c>
+++ /dev/null
-#include <sysdeps/sparc/nptl/sem_timedwait.c>
+++ /dev/null
-#include <nptl/sem_trywait.c>
-#include <sysdeps/sparc/nptl/sem_wait.c>
+#include <nptl/sem_wait.c>
--- /dev/null
+#include <nptl/sem_waitcommon.c>
projects / external / glibc.git / commitdiff