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(__pthread_trylock): Define inline. (__pthread_lock): Add extra parameter to declaration. Declare using internal_function. (__pthread_unlock): Declare using internal_function.

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Ulrich Drepper 1998-10-29 14:31:12 +00:00
parent cf3a0eca81
commit 05e951cd1a
1 changed files with 26 additions and 15 deletions
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41
linuxthreads/spinlock.h
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@ -12,20 +12,6 @@
/* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */ /* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the */
/* GNU Library General Public License for more details. */ /* GNU Library General Public License for more details. */
/* Internal locks */
extern void __pthread_lock(struct _pthread_fastlock * lock);
extern int __pthread_trylock(struct _pthread_fastlock * lock);
extern void __pthread_unlock(struct _pthread_fastlock * lock);
static inline void __pthread_init_lock(struct _pthread_fastlock * lock)
{
lock->__status = 0;
lock->__spinlock = 0;
}
#define LOCK_INITIALIZER {0, 0}
#if defined(TEST_FOR_COMPARE_AND_SWAP) #if defined(TEST_FOR_COMPARE_AND_SWAP)
extern int __pthread_has_cas; extern int __pthread_has_cas;
@ -35,7 +21,7 @@ extern int __pthread_compare_and_swap(long * ptr, long oldval, long newval,
static inline int compare_and_swap(long * ptr, long oldval, long newval, static inline int compare_and_swap(long * ptr, long oldval, long newval,
int * spinlock) int * spinlock)
{ {
if (__pthread_has_cas) if (__builtin_expect (__pthread_has_cas, 1))
return __compare_and_swap(ptr, oldval, newval); return __compare_and_swap(ptr, oldval, newval);
else else
return __pthread_compare_and_swap(ptr, oldval, newval, spinlock); return __pthread_compare_and_swap(ptr, oldval, newval, spinlock);
@ -61,3 +47,28 @@ static inline int compare_and_swap(long * ptr, long oldval, long newval,
} }
#endif #endif
/* Internal locks */
extern void internal_function __pthread_lock(struct _pthread_fastlock * lock,
pthread_descr self);
extern void internal_function __pthread_unlock(struct _pthread_fastlock *lock);
static inline void __pthread_init_lock(struct _pthread_fastlock * lock)
{
lock->__status = 0;
lock->__spinlock = 0;
}
static inline int __pthread_trylock (struct _pthread_fastlock * lock)
{
long oldstatus;
do {
oldstatus = lock->__status;
if (oldstatus != 0) return EBUSY;
} while(! compare_and_swap(&lock->__status, 0, 1, &lock->__spinlock));
return 0;
}
#define LOCK_INITIALIZER {0, 0}