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Add pthread_mutex_islocked_np(), a cheap way to verify that a mutex is

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locked.  This is intended primarily to support the userland equivalent
of the various *_ASSERT_LOCKED() macros we have in the kernel.

MFC after:	2 weeks
This commit is contained in:
Dag-Erling Smørgrav 2008-02-03 22:38:10 +00:00
parent 8dbd3d1b6b
commit 5fd410a787
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=175958
3 changed files with 32 additions and 0 deletions
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1
include/pthread_np.h
View File

@ -53,6 +53,7 @@ int pthread_mutex_getspinloops_np(pthread_mutex_t *mutex, int *count);
int pthread_mutex_setspinloops_np(pthread_mutex_t *mutex, int count);
int pthread_mutex_getyieldloops_np(pthread_mutex_t *mutex, int *count);
int pthread_mutex_setyieldloops_np(pthread_mutex_t *mutex, int count);
int pthread_mutex_islocked_np(pthread_mutex_t *mutex);
int pthread_single_np(void);
void pthread_suspend_all_np(void);
int pthread_suspend_np(pthread_t);

15
lib/libthr/pthread.map
View File

@ -395,3 +395,18 @@ global:
local:
*;
};
FBSD_1.1 {
global:
pthread_mutex_islocked_np;
local:
*;
} FBSD_1.0;
FBSDprivate_1.1 {
global:
_pthread_mutex_islocked_np;
local:
*;
} FBSDprivate_1.0;

16
lib/libthr/thread/thr_mutex.c
View File

@ -87,6 +87,7 @@ int __pthread_mutex_setspinloops_np(pthread_mutex_t *mutex, int count);
int _pthread_mutex_setyieldloops_np(pthread_mutex_t *mutex, int count);
int _pthread_mutex_getyieldloops_np(pthread_mutex_t *mutex, int *count);
int __pthread_mutex_setyieldloops_np(pthread_mutex_t *mutex, int count);
int _pthread_mutex_islocked_np(pthread_mutex_t *mutex);
static int mutex_self_trylock(pthread_mutex_t);
static int mutex_self_lock(pthread_mutex_t,
@ -111,6 +112,7 @@ __weak_reference(_pthread_mutex_getspinloops_np, pthread_mutex_getspinloops_np);
__weak_reference(__pthread_mutex_setyieldloops_np, pthread_mutex_setyieldloops_np);
__weak_reference(_pthread_mutex_getyieldloops_np, pthread_mutex_getyieldloops_np);
__weak_reference(_pthread_mutex_islocked_np, pthread_mutex_islocked_np);
static int
mutex_init(pthread_mutex_t *mutex,
@ -863,3 +865,17 @@ __pthread_mutex_setyieldloops_np(pthread_mutex_t *mutex, int count)
(*mutex)->m_yieldloops = count;
return (0);
}
int
_pthread_mutex_islocked_np(pthread_mutex_t *mutex)
{
struct pthread *curthread = _get_curthread();
int ret;
if (__predict_false(*mutex == NULL)) {
ret = init_static(curthread, mutex);
if (__predict_false(ret))
return (ret);
}
return ((*mutex)->m_qe.tqe_prev != NULL);
}