* sysdeps/unix/sysv/linux/smp.h: New file.
* sysdeps/unix/sysv/linux/sh/smp.h: New file.
* init.c: Define __is_smp.
(__pthread_initialize_minimal_internal): Call is_smp_system to
initialize __is_smp.
* pthreadP.h: Declare __is_smp.
Define MAX_ADAPTIVE_COUNT is necessary.
* pthread_mutex_init.c: Add comment regarding __spins field.
* pthread_mutex_lock.c: Implement adaptive mutex type.
* pthread_mutex_timedlock.c: Likewise.
* sysdeps/unix/sysv/linux/pthread_mutex_cond_lock.c: Likewise.
* sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h (pthread_mutex_t):
Add __spins field.
* sysdeps/unix/sysv/linux/i386/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/ia64/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/sh/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/s390/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/sparc/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/x86_64/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h: Define
lll_mutex_cond_trylock.
* sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/sh/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/s390/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/sparc/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/i386/bits/pthreadtypes.h: Likewise.
Define BUSY_WAIT_NOP.
* sysdeps/unix/sysv/linux/ia64/bits/pthreadtypes.h: Likewise.
* sysdeps/unix/sysv/linux/x86_64/bits/pthreadtypes.h: Likewise.
* tst-mutex5.c: Add support for testing adaptive mutexes.
* tst-mutex7.c: Likewise.
* tst-mutex5a.c: New file.
* tst-mutex7a.c: New file.
* Makefile (tests): Add tst-mutex5a and tst-mutex7a.
-NPTL 0.60 by Ulrich Drepper
+NPTL 0.61 by Ulrich Drepper
2004-03-23 Ulrich Drepper <drepper@redhat.com>
+ * sysdeps/unix/sysv/linux/smp.h: New file.
+ * sysdeps/unix/sysv/linux/sh/smp.h: New file.
+ * init.c: Define __is_smp.
+ (__pthread_initialize_minimal_internal): Call is_smp_system to
+ initialize __is_smp.
+ * pthreadP.h: Declare __is_smp.
+ Define MAX_ADAPTIVE_COUNT is necessary.
+ * pthread_mutex_init.c: Add comment regarding __spins field.
+ * pthread_mutex_lock.c: Implement adaptive mutex type.
+ * pthread_mutex_timedlock.c: Likewise.
+ * sysdeps/unix/sysv/linux/pthread_mutex_cond_lock.c: Likewise.
+ * sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h (pthread_mutex_t):
+ Add __spins field.
+ * sysdeps/unix/sysv/linux/i386/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/ia64/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/sh/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/s390/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/sparc/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/x86_64/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/alpha/bits/pthreadtypes.h: Define
+ lll_mutex_cond_trylock.
+ * sysdeps/unix/sysv/linux/powerpc/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/sh/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/s390/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/sparc/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/i386/bits/pthreadtypes.h: Likewise.
+ Define BUSY_WAIT_NOP.
+ * sysdeps/unix/sysv/linux/ia64/bits/pthreadtypes.h: Likewise.
+ * sysdeps/unix/sysv/linux/x86_64/bits/pthreadtypes.h: Likewise.
+
+ * tst-mutex5.c: Add support for testing adaptive mutexes.
+ * tst-mutex7.c: Likewise.
+ * tst-mutex5a.c: New file.
+ * tst-mutex7a.c: New file.
+ * Makefile (tests): Add tst-mutex5a and tst-mutex7a.
+
* sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
(__lll_mutex_timedlock_wait): Preserve r8 and r9 since the
vgettimeofday call miht destroy the content.
tests = tst-attr1 tst-attr2 tst-attr3 \
tst-mutex1 tst-mutex2 tst-mutex3 tst-mutex4 tst-mutex5 tst-mutex6 \
- tst-mutex7 tst-mutex8 tst-mutex9 \
+ tst-mutex7 tst-mutex8 tst-mutex9 tst-mutex5a tst-mutex7a \
tst-spin1 tst-spin2 tst-spin3 \
tst-cond1 tst-cond2 tst-cond3 tst-cond4 tst-cond5 tst-cond6 tst-cond7 \
tst-cond8 tst-cond9 tst-cond10 tst-cond11 tst-cond12 tst-cond13 \
#include <fork.h>
#include <version.h>
#include <shlib-compat.h>
+#include <smp.h>
#ifndef __NR_set_tid_address
size_t __static_tls_size;
size_t __static_tls_align_m1;
+/* Flag whether the machine is SMP or not. */
+int __is_smp attribute_hidden;
+
/* Version of the library, used in libthread_db to detect mismatches. */
static const char nptl_version[] __attribute_used__ = VERSION;
#endif
__libc_pthread_init (&__fork_generation, __reclaim_stacks,
ptr_pthread_functions);
+
+ /* Determine whether the machine is SMP or not. */
+ __is_smp = is_smp_system ();
}
strong_alias (__pthread_initialize_minimal_internal,
__pthread_initialize_minimal)
#endif
+/* Adaptive mutex definitions. */
+#ifndef MAX_ADAPTIVE_COUNT
+# define MAX_ADAPTIVE_COUNT 100
+#endif
+
+
/* Internal variables. */
extern size_t __static_tls_size attribute_hidden;
extern size_t __static_tls_align_m1 attribute_hidden;
+/* Flag whether the machine is SMP or not. */
+extern int __is_smp attribute_hidden;
+
/* Thread descriptor handling. */
extern list_t __stack_user;
hidden_proto (__stack_user)
-/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
// mutex->__count = 0; already done by memset
// mutex->__owner = 0; already done by memset
// mutex->__nusers = 0; already done by memset
+ // mutex->__spins = 0; already done by memset
return 0;
}
-/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
#ifndef LLL_MUTEX_LOCK
# define LLL_MUTEX_LOCK(mutex) lll_mutex_lock (mutex)
+# define LLL_MUTEX_TRYLOCK(mutex) lll_mutex_trylock (mutex)
#endif
__pthread_mutex_lock (mutex)
pthread_mutex_t *mutex;
{
+ assert (sizeof (mutex->__size) >= sizeof (mutex->__data));
+
pid_t id = THREAD_GETMEM (THREAD_SELF, tid);
switch (__builtin_expect (mutex->__data.__kind, PTHREAD_MUTEX_TIMED_NP))
default:
/* Correct code cannot set any other type. */
case PTHREAD_MUTEX_TIMED_NP:
- case PTHREAD_MUTEX_ADAPTIVE_NP:
+ simple:
/* Normal mutex. */
LLL_MUTEX_LOCK (mutex->__data.__lock);
break;
+
+ case PTHREAD_MUTEX_ADAPTIVE_NP:
+ if (! __is_smp)
+ goto simple;
+
+ if (LLL_MUTEX_TRYLOCK (mutex->__data.__lock) != 0)
+ {
+ int cnt = 0;
+ int max_cnt = MIN (MAX_ADAPTIVE_COUNT,
+ mutex->__data.__spins * 2 + 10);
+ do
+ {
+ if (cnt++ >= max_cnt)
+ {
+ LLL_MUTEX_LOCK (mutex->__data.__lock);
+ break;
+ }
+
+#ifdef BUSY_WAIT_NOP
+ BUSY_WAIT_NOP;
+#endif
+ }
+ while (LLL_MUTEX_TRYLOCK (mutex->__data.__lock) != 0);
+
+ mutex->__data.__spins += (cnt - mutex->__data.__spins) / 8;
+ }
+ break;
}
/* Record the ownership. */
-/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
default:
/* Correct code cannot set any other type. */
case PTHREAD_MUTEX_TIMED_NP:
- case PTHREAD_MUTEX_ADAPTIVE_NP:
+ simple:
/* Normal mutex. */
result = lll_mutex_timedlock (mutex->__data.__lock, abstime);
break;
+
+ case PTHREAD_MUTEX_ADAPTIVE_NP:
+ if (! __is_smp)
+ goto simple;
+
+ if (lll_mutex_trylock (mutex->__data.__lock) != 0)
+ {
+ int cnt = 0;
+ int max_cnt = MIN (MAX_ADAPTIVE_COUNT,
+ mutex->__data.__spins * 2 + 10);
+ do
+ {
+ if (cnt++ >= max_cnt)
+ {
+ result = lll_mutex_timedlock (mutex->__data.__lock, abstime);
+ break;
+ }
+
+#ifdef BUSY_WAIT_NOP
+ BUSY_WAIT_NOP;
+#endif
+ }
+ while (lll_mutex_trylock (mutex->__data.__lock) != 0);
+
+ mutex->__data.__spins += (cnt - mutex->__data.__spins) / 8;
+ }
+ break;
}
if (result == 0)
/* Machine-specific pthread type layouts. Alpha version.
- Copyright (C) 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004 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
/* KIND must stay at this position in the structure to maintain
binary compatibility. */
int __kind;
+ int __spins;
} __data;
char __size[__SIZEOF_PTHREAD_MUTEX_T];
long int __align;
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004 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
#define lll_mutex_trylock(lock) __lll_mutex_trylock (&(lock))
+static inline int __attribute__((always_inline))
+__lll_mutex_cond_trylock(int *futex)
+{
+ return atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0;
+}
+#define lll_mutex_cond_trylock(lock) __lll_mutex_cond_trylock (&(lock))
+
+
extern void __lll_lock_wait (int *futex) attribute_hidden;
static inline void __attribute__((always_inline))
-/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2004 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
binary compatibility. */
int __kind;
unsigned int __nusers;
+ int __spins;
} __data;
char __size[__SIZEOF_PTHREAD_MUTEX_T];
long int __align;
/* Initializer for compatibility lock. */
#define LLL_MUTEX_LOCK_INITIALIZER (0)
#define LLL_MUTEX_LOCK_INITIALIZER_LOCKED (1)
+#define LLL_MUTEX_LOCK_INITIALIZER_WAITERS (2)
#ifdef PIC
# define LLL_ENTER_KERNEL "int $0x80\n\t"
#endif
+/* Delay in spinlock loop. */
+#define BUSY_WAIT_NOP asm ("rep; nop")
+
#define lll_futex_wait(futex, val) \
do { \
ret; })
+#define lll_mutex_cond_trylock(futex) \
+ ({ int ret; \
+ __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
+ : "=a" (ret), "=m" (futex) \
+ : "r" (LLL_MUTEX_LOCK_INITIALIZER_WAITERS), \
+ "m" (futex), "0" (LLL_MUTEX_LOCK_INITIALIZER) \
+ : "memory"); \
+ ret; })
+
+
#define lll_mutex_lock(futex) \
(void) ({ int ignore1, ignore2; \
__asm __volatile (LOCK_INSTR "cmpxchgl %1, %2\n\t" \
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
/* KIND must stay at this position in the structure to maintain
binary compatibility. */
int __kind;
+ int __spins;
} __data;
char __size[__SIZEOF_PTHREAD_MUTEX_T];
long int __align;
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
#define FUTEX_WAKE 1
#define FUTEX_REQUEUE 3
+/* Delay in spinlock loop. */
+#define BUSY_WAIT_NOP asm ("hint @pause")
+
/* Initializer for compatibility lock. */
#define LLL_MUTEX_LOCK_INITIALIZER (0)
#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
+#define __lll_mutex_cond_trylock(futex) \
+ (atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0)
+#define lll_mutex_cond_trylock(futex) __lll_mutex_cond_trylock (&(futex))
+
+
extern void __lll_lock_wait (int *futex) attribute_hidden;
/* Machine-specific pthread type layouts. PowerPC version.
- Copyright (C) 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
#if __WORDSIZE != 64
unsigned int __nusers;
#endif
+ int __spins;
} __data;
char __size[__SIZEOF_PTHREAD_MUTEX_T];
long int __align;
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Paul Mackerras <paulus@au.ibm.com>, 2003.
#define lll_mutex_trylock(lock) __lll_trylock (&(lock))
+/* Set *futex to 2 if it is 0, atomically. Returns the old value */
+#define lll_mutex_cond_trylock(futex) \
+ ({ int __val; \
+ __asm __volatile ("1: lwarx %0,0,%2\n" \
+ " cmpwi 0,%0,0\n" \
+ " bne 2f\n" \
+ " stwcx. %3,0,%2\n" \
+ " bne- 1b\n" \
+ "2: " __lll_acq_instr \
+ : "=&r" (__val), "=m" (*futex) \
+ : "r" (futex), "r" (2), "1" (*futex) \
+ : "cr0", "memory"); \
+ __val; \
+ })
+
extern void __lll_lock_wait (int *futex) attribute_hidden;
#include <pthreadP.h>
#define LLL_MUTEX_LOCK(mutex) lll_mutex_cond_lock(mutex)
+#define LLL_MUTEX_TRYLOCK(mutex) lll_mutex_cond_trylock(mutex)
#define __pthread_mutex_lock __pthread_mutex_cond_lock
#define NO_INCR
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
#if __WORDSIZE != 64
unsigned int __nusers;
#endif
+ int __spins;
} __data;
char __size[__SIZEOF_PTHREAD_MUTEX_T];
long int __align;
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Martin Schwidefsky <schwidefsky@de.ibm.com>, 2003.
#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
+static inline int
+__attribute__ ((always_inline))
+__lll_mutex_cond_trylock (int *futex)
+{
+ unsigned int old;
+
+ __asm __volatile ("cs %0,%3,%1"
+ : "=d" (old), "=Q" (*futex)
+ : "0" (0), "d" (2), "m" (*futex) : "cc" );
+ return old != 0;
+}
+#define lll_mutex_cond_trylock(futex) __lll_mutex_cond_trylock (&(futex))
+
+
extern void __lll_lock_wait (int *futex) attribute_hidden;
static inline void
-/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
binary compatibility. */
int __kind;
unsigned int __nusers;
+ int __spins;
} __data;
char __size[__SIZEOF_PTHREAD_MUTEX_T];
long int __align;
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004 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
/* Initializer for compatibility lock. */
#define LLL_MUTEX_LOCK_INITIALIZER (0)
#define LLL_MUTEX_LOCK_INITIALIZER_LOCKED (1)
+#define LLL_MUTEX_LOCK_INITIALIZER_WAITERS (2)
extern int __lll_mutex_lock_wait (int val, int *__futex) attribute_hidden;
extern int __lll_mutex_timedlock_wait (int val, int *__futex,
: "r0", "r1", "r2", "t", "memory"); \
__result; })
+#define lll_mutex_cond_trylock(futex) \
+ ({ unsigned char __result; \
+ __asm __volatile ("\
+ .align 2\n\
+ mova 1f,r0\n\
+ nop\n\
+ mov r15,r1\n\
+ mov #-8,r15\n\
+ 0: mov.l @%1,r2\n\
+ cmp/eq r2,%3\n\
+ bf 1f\n\
+ mov.l %2,@%1\n\
+ 1: mov r1,r15\n\
+ mov #-1,%0\n\
+ negc %0,%0"\
+ : "=r" (__result) \
+ : "r" (&(futex)), \
+ "r" (LLL_MUTEX_LOCK_INITIALIZER_WAITERS), \
+ "r" (LLL_MUTEX_LOCK_INITIALIZER) \
+ : "r0", "r1", "r2", "t", "memory"); \
+ __result; })
+
#define lll_mutex_lock(futex) \
(void) ({ int __result, val, *__futex = &(futex); \
__asm __volatile ("\
--- /dev/null
+/* Determine whether the host has multiple processors. SH version.
+ Copyright (C) 2002 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+static inline int
+is_smp_system (void)
+{
+ return 0;
+}
--- /dev/null
+/* Determine whether the host has multiple processors. Linux version.
+ Copyright (C) 1996, 2002, 2004 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 Library General Public License as
+ published by the Free Software Foundation; either version 2 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
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <fcntl.h>
+#include <string.h>
+#include <sys/sysctl.h>
+
+/* Test whether the machine has more than one processor. This is not the
+ best test but good enough. More complicated tests would require `malloc'
+ which is not available at that time. */
+static inline int
+is_smp_system (void)
+{
+ static const int sysctl_args[] = { CTL_KERN, KERN_VERSION };
+ char buf[512];
+ size_t reslen = sizeof (buf);
+
+ /* Try reading the number using `sysctl' first. */
+ if (__sysctl ((int *) sysctl_args,
+ sizeof (sysctl_args) / sizeof (sysctl_args[0]),
+ buf, &reslen, NULL, 0) < 0)
+ {
+ /* This was not successful. Now try reading the /proc filesystem. */
+ int fd = __open ("/proc/sys/kernel/version", O_RDONLY);
+ if (__builtin_expect (fd, 0) == -1
+ || (reslen = __read (fd, buf, sizeof (buf))) <= 0)
+ /* This also didn't work. We give up and say it's a UP machine. */
+ buf[0] = '\0';
+
+ __close (fd);
+ }
+
+ return strstr (buf, "SMP") != NULL;
+}
/* Machine-specific pthread type layouts. SPARC version.
- Copyright (C) 2003 Free Software Foundation, Inc.
+ Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
#if __WORDSIZE != 64
unsigned int __nusers;
#endif
+ int __spins;
} __data;
char __size[__SIZEOF_PTHREAD_MUTEX_T];
long int __align;
-/* Copyright (C) 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Jakub Jelinek <jakub@redhat.com>, 2003.
}
#define lll_mutex_trylock(futex) __lll_mutex_trylock (&(futex))
+static inline int
+__attribute__ ((always_inline))
+__lll_mutex_cond_trylock (int *futex)
+{
+ return atomic_compare_and_exchange_val_acq (futex, 2, 0) != 0;
+}
+#define lll_mutex_cond_trylock(futex) __lll_mutex_cond_trylock (&(futex))
+
extern void __lll_lock_wait (int *futex) attribute_hidden;
{
int val = atomic_compare_and_exchange_val_acq (futex, 1, 0);
int result = 0;
-
+
if (__builtin_expect (val != 0, 0))
result = __lll_timedlock_wait (futex, abstime);
return result;
-/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
/* KIND must stay at this position in the structure to maintain
binary compatibility. */
int __kind;
+ int __spins;
} __data;
char __size[__SIZEOF_PTHREAD_MUTEX_T];
long int __align;
-/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
/* Initializer for compatibility lock. */
#define LLL_MUTEX_LOCK_INITIALIZER (0)
#define LLL_MUTEX_LOCK_INITIALIZER_LOCKED (1)
+#define LLL_MUTEX_LOCK_INITIALIZER_WAITERS (2)
+
+/* Delay in spinlock loop. */
+#define BUSY_WAIT_NOP asm ("rep; nop")
#define lll_futex_wait(futex, val) \
extern int __lll_mutex_unlock_wait (int *__futex) attribute_hidden;
+/* NB: in the lll_mutex_trylock macro we simply return the value in %eax
+ after the cmpxchg instruction. In case the operation succeded this
+ value is zero. In case the operation failed, the cmpxchg instruction
+ has loaded the current value of the memory work which is guaranteed
+ to be nonzero. */
#define lll_mutex_trylock(futex) \
- ({ unsigned char ret; \
- __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1; setne %0" \
+ ({ int ret; \
+ __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
: "=a" (ret), "=m" (futex) \
: "r" (LLL_MUTEX_LOCK_INITIALIZER_LOCKED), "m" (futex),\
"0" (LLL_MUTEX_LOCK_INITIALIZER) \
ret; })
+#define lll_mutex_cond_trylock(futex) \
+ ({ int ret; \
+ __asm __volatile (LOCK_INSTR "cmpxchgl %2, %1" \
+ : "=a" (ret), "=m" (futex) \
+ : "r" (LLL_MUTEX_LOCK_INITIALIZER_WAITERS), \
+ "m" (futex), "0" (LLL_MUTEX_LOCK_INITIALIZER) \
+ : "memory"); \
+ ret; })
+
+
#define lll_mutex_lock(futex) \
(void) ({ int ignore1, ignore2, ignore3; \
__asm __volatile (LOCK_INSTR "cmpxchgl %0, %2\n\t" \
-/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003, 2004 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
#include <sys/time.h>
+#ifndef TYPE
+# define TYPE PTHREAD_MUTEX_NORMAL
+#endif
+
+
static int
do_test (void)
{
struct timeval tv;
struct timeval tv2;
int err;
+ pthread_mutexattr_t a;
+
+ if (pthread_mutexattr_init (&a) != 0)
+ {
+ puts ("mutexattr_init failed");
+ return 1;
+ }
+
+ if (pthread_mutexattr_settype (&a, TYPE) != 0)
+ {
+ puts ("mutexattr_settype failed");
+ return 1;
+ }
- if (pthread_mutex_init (&m, NULL) != 0)
+ if (pthread_mutex_init (&m, &a) != 0)
{
puts ("mutex_init failed");
return 1;
}
+ if (pthread_mutexattr_destroy (&a) != 0)
+ {
+ puts ("mutexattr_destroy failed");
+ return 1;
+ }
+
if (pthread_mutex_lock (&m) != 0)
{
puts ("mutex_lock failed");
--- /dev/null
+#define TYPE PTHREAD_MUTEX_ADAPTIVE_NP
+#include "tst-mutex5.c"
#include <time.h>
-static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
+#ifndef INIT
+# define INIT PTHREAD_MUTEX_INITIALIZER
+#endif
+
+
+static pthread_mutex_t lock = INIT;
#define ROUNDS 1000
--- /dev/null
+#define INIT PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
+#include "tst-mutex7.c"