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Reduce lock contention for simple cases.

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# this really should be done with pthread_once, but I've debugged this code.

Reviewed by: arch@
This commit is contained in:
imp 2007-12-19 04:30:10 +00:00
parent 7d62c26d32
commit d140ab1c44
1 changed files with 22 additions and 16 deletions
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38
lib/libc/stdtime/localtime.c
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@ -1093,14 +1093,16 @@ const time_t * const timep;
struct tm *p_tm;
if (__isthreaded != 0) {
_pthread_mutex_lock(&localtime_mutex);
if (localtime_key < 0) {
if (_pthread_key_create(&localtime_key, free) < 0) {
_pthread_mutex_unlock(&localtime_mutex);
return(NULL);
_pthread_mutex_lock(&localtime_mutex);
if (localtime_key < 0) {
if (_pthread_key_create(&localtime_key, free) < 0) {
_pthread_mutex_unlock(&localtime_mutex);
return(NULL);
}
}
_pthread_mutex_unlock(&localtime_mutex);
}
_pthread_mutex_unlock(&localtime_mutex);
p_tm = _pthread_getspecific(localtime_key);
if (p_tm == NULL) {
if ((p_tm = (struct tm *)malloc(sizeof(struct tm)))
@ -1146,16 +1148,18 @@ const time_t * const timep;
const long offset;
struct tm * const tmp;
{
_MUTEX_LOCK(&gmt_mutex);
if (!gmt_is_set) {
gmt_is_set = TRUE;
_MUTEX_LOCK(&gmt_mutex);
if (!gmt_is_set) {
#ifdef ALL_STATE
gmtptr = (struct state *) malloc(sizeof *gmtptr);
if (gmtptr != NULL)
gmtptr = (struct state *) malloc(sizeof *gmtptr);
if (gmtptr != NULL)
#endif /* defined ALL_STATE */
gmtload(gmtptr);
gmtload(gmtptr);
gmt_is_set = TRUE;
}
_MUTEX_UNLOCK(&gmt_mutex);
}
_MUTEX_UNLOCK(&gmt_mutex);
timesub(timep, offset, gmtptr, tmp);
#ifdef TM_ZONE
/*
@ -1187,14 +1191,16 @@ const time_t * const timep;
struct tm *p_tm;
if (__isthreaded != 0) {
_pthread_mutex_lock(&gmtime_mutex);
if (gmtime_key < 0) {
if (_pthread_key_create(&gmtime_key, free) < 0) {
_pthread_mutex_unlock(&gmtime_mutex);
return(NULL);
_pthread_mutex_lock(&gmtime_mutex);
if (gmtime_key < 0) {
if (_pthread_key_create(&gmtime_key, free) < 0) {
_pthread_mutex_unlock(&gmtime_mutex);
return(NULL);
}
}
_pthread_mutex_unlock(&gmtime_mutex);
}
_pthread_mutex_unlock(&gmtime_mutex);
/*
* Changed to follow POSIX.1 threads standard, which
* is what BSD currently has.