New environment variable GLIBC_PTHREAD_DEFAULT_STACKSIZE to do this.
+2013-03-01 Siddhesh Poyarekar <siddhesh@redhat.com>
+
+ * csu/libc-start.c (__pthread_initialize_minimal): Change
+ function arguments.
+ * csu/libc-tls.c (__pthread_initialize_minimal): Likewise.
+
2013-02-28 Joseph Myers <joseph@codesourcery.com>
[BZ #13550]
and program exit. This needs compiler support for offloading C++11
destructor calls to glibc.
+* Add support for setting thread stack sizes from the program environment,
+ independently of the process stack size using the
+ GLIBC_PTHREAD_DEFAULT_STACKSIZE environment variable.
+
\f
Version 2.17
#include <tls.h>
#ifndef SHARED
# include <dl-osinfo.h>
-extern void __pthread_initialize_minimal (void);
+extern void __pthread_initialize_minimal (int, char **, char **);
# ifndef THREAD_SET_STACK_GUARD
/* Only exported for architectures that don't store the stack guard canary
in thread local area. */
/* Initialize the thread library at least a bit since the libgcc
functions are using thread functions if these are available and
we need to setup errno. */
- __pthread_initialize_minimal ();
+ __pthread_initialize_minimal (argc, argv, __environ);
/* Set up the stack checker's canary. */
uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard (_dl_random);
not used. */
void
__attribute__ ((weak))
-__pthread_initialize_minimal (void)
+__pthread_initialize_minimal (int argc, char **argv, char **envp)
{
__libc_setup_tls (TLS_INIT_TCB_SIZE, TLS_INIT_TCB_ALIGN);
}
+2013-03-01 Siddhesh Poyarekar <siddhesh@redhat.com>
+
+ * Makefile (tests): Add tst-pthread-stack-env.
+ (tst-pthread-stack-env-ENV): Set environment for test.
+ * nptl-init.c (set_default_stacksize): New function.
+ (__pthread_initialize_minimal_internal): Accept ARGC, ARGV and
+ ENVP. Initialize __ENVIRON and set __DEFAULT_STACKSIZE.
+ * tst-pthread-stack-env.c: New test case.
+
2013-02-21 David S. Miller <davem@davemloft.net>
* sysdeps/unix/sysv/linux/sparc/lowlevellock.h
tst-exec1 tst-exec2 tst-exec3 tst-exec4 \
tst-exit1 tst-exit2 tst-exit3 \
tst-stdio1 tst-stdio2 \
- tst-stack1 tst-stack2 tst-stack3 tst-pthread-getattr \
+ tst-stack1 tst-stack2 tst-stack3 \
+ tst-pthread-getattr tst-pthread-stack-env \
tst-unload \
tst-dlsym1 \
tst-sysconf \
tst-cancelx7-ARGS = $(tst-cancel7-ARGS)
tst-umask1-ARGS = $(objpfx)tst-umask1.temp
+tst-pthread-stack-env-ENV = GLIBC_PTHREAD_DEFAULT_STACKSIZE=1048576
+
$(objpfx)tst-atfork2: $(libdl) $(shared-thread-library)
LDFLAGS-tst-atfork2 = -rdynamic
tst-atfork2-ENV = MALLOC_TRACE=$(objpfx)tst-atfork2.mtrace
/* This can be set by the debugger before initialization is complete. */
static bool __nptl_initial_report_events __attribute_used__;
+static void
+set_default_stacksize (size_t stacksize)
+{
+ if (stacksize < PTHREAD_STACK_MIN)
+ stacksize = PTHREAD_STACK_MIN;
+
+ /* Make sure it meets the minimum size that allocate_stack
+ (allocatestack.c) will demand, which depends on the page size. */
+ const uintptr_t pagesz = GLRO(dl_pagesize);
+ const size_t minstack = pagesz + __static_tls_size + MINIMAL_REST_STACK;
+
+ if (stacksize < minstack)
+ stacksize = minstack;
+
+ /* Round the resource limit up to page size. */
+ stacksize = (stacksize + pagesz - 1) & -pagesz;
+ __default_stacksize = stacksize;
+}
void
-__pthread_initialize_minimal_internal (void)
+__pthread_initialize_minimal_internal (int argc, char **argv, char **envp)
{
#ifndef SHARED
/* Unlike in the dynamically linked case the dynamic linker has not
__static_tls_size = roundup (__static_tls_size, static_tls_align);
- /* Determine the default allowed stack size. This is the size used
- in case the user does not specify one. */
- struct rlimit limit;
- if (getrlimit (RLIMIT_STACK, &limit) != 0
- || limit.rlim_cur == RLIM_INFINITY)
- /* The system limit is not usable. Use an architecture-specific
- default. */
- limit.rlim_cur = ARCH_STACK_DEFAULT_SIZE;
- else if (limit.rlim_cur < PTHREAD_STACK_MIN)
- /* The system limit is unusably small.
- Use the minimal size acceptable. */
- limit.rlim_cur = PTHREAD_STACK_MIN;
+ /* Initialize the environment. libc.so gets initialized after us due to a
+ circular dependency and hence __environ is not available otherwise. */
+ __environ = envp;
- /* Make sure it meets the minimum size that allocate_stack
- (allocatestack.c) will demand, which depends on the page size. */
- const uintptr_t pagesz = GLRO(dl_pagesize);
- const size_t minstack = pagesz + __static_tls_size + MINIMAL_REST_STACK;
- if (limit.rlim_cur < minstack)
- limit.rlim_cur = minstack;
+#ifndef SHARED
+ __libc_init_secure ();
+#endif
- /* Round the resource limit up to page size. */
- limit.rlim_cur = (limit.rlim_cur + pagesz - 1) & -pagesz;
- __default_stacksize = limit.rlim_cur;
+ size_t stacksize = 0;
+ char *envval = __libc_secure_getenv ("GLIBC_PTHREAD_DEFAULT_STACKSIZE");
+
+ if (__glibc_unlikely (envval != NULL && envval[0] != '\0'))
+ {
+ char *env_conv = envval;
+ size_t ret = strtoul (envval, &env_conv, 0);
+
+ if (*env_conv == '\0' && env_conv != envval)
+ stacksize = ret;
+ }
+
+ if (stacksize == 0)
+ {
+ /* Determine the default allowed stack size. This is the size used
+ in case the user does not specify one. */
+ struct rlimit limit;
+ if (getrlimit (RLIMIT_STACK, &limit) != 0
+ || limit.rlim_cur == RLIM_INFINITY)
+ /* The system limit is not usable. Use an architecture-specific
+ default. */
+ stacksize = ARCH_STACK_DEFAULT_SIZE;
+ else
+ stacksize = limit.rlim_cur;
+ }
+
+ set_default_stacksize (stacksize);
#ifdef SHARED
/* Transfer the old value from the dynamic linker's internal location. */
--- /dev/null
+/* Verify that pthreads uses the default thread stack size set with the
+ GLIBC_PTHREAD_DEFAULT_STACKSIZE environment variable.
+ Copyright (C) 2013 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ 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 <pthread.h>
+#include <stdio.h>
+#include <string.h>
+
+/* It is possible that the default stack size somehow ends up being 1MB, thus
+ giving a false positive. The ideal way to test this would be to get the
+ current stacksize fork a process with the default stack size set to
+ something different to the current stack size and verify in the child
+ process that the environment variable worked. */
+#define STACKSIZE 1024 * 1024L
+
+void *
+thr (void *u)
+{
+ size_t stacksize, guardsize;
+ pthread_attr_t attr;
+ pthread_getattr_np (pthread_self (), &attr);
+
+ pthread_attr_getstacksize (&attr, &stacksize);
+ pthread_attr_getguardsize (&attr, &guardsize);
+
+ /* FIXME once guardsize is excluded from stacksize. */
+ if (stacksize - guardsize != STACKSIZE)
+ {
+ printf ("Stack size is %zu, should be %zu\n", stacksize - guardsize,
+ STACKSIZE);
+ return (void *) 1;
+ }
+
+ return NULL;
+}
+
+int
+do_test (int argc, char **argv)
+{
+ pthread_t t;
+ void *thr_ret;
+ int ret;
+
+ if ((ret = pthread_create (&t, NULL, thr, NULL)) != 0)
+ {
+ printf ("thread create failed: %s\n", strerror (ret));
+ return 1;
+ }
+
+ if ((ret = pthread_join (t, &thr_ret)) != 0)
+ {
+ printf ("join failed: %s\n", strerror (ret));
+ return 1;
+ }
+
+ if (thr_ret != NULL && thr_ret != PTHREAD_CANCELED)
+ return 1;
+
+ return 0;
+}
+
+#include "../test-skeleton.c"
projects / external / glibc.git / commitdiff