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Stephen Cook <siti_veni@lycos.com>:

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- removed the function-in-function for qsort.
  replaced with a static function with a static variable.
  now protected with pthread mutex.
This commit is contained in:
Takashi Iwai 2004-01-26 15:54:10 +00:00
parent e723625bfa
commit ef5b272b28
1 changed files with 15 additions and 5 deletions
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20
src/control/hcontrol.c
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@ -48,6 +48,7 @@ to reduce overhead accessing the real controls in kernel drivers.
#include <string.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <pthread.h>
#ifndef DOC_HIDDEN
#define __USE_GNU
#endif
@ -409,17 +410,26 @@ int snd_hctl_free(snd_hctl_t *hctl)
return 0;
}
static snd_hctl_t *compare_hctl;
static int hctl_compare(const void *a, const void *b) {
return compare_hctl->compare(*(const snd_hctl_elem_t * const *) a,
*(const snd_hctl_elem_t * const *) b);
}
static void snd_hctl_sort(snd_hctl_t *hctl)
{
unsigned int k;
int compar(const void *a, const void *b) {
return hctl->compare(*(const snd_hctl_elem_t * const *) a,
*(const snd_hctl_elem_t * const *) b);
}
static pthread_mutex_t sync_lock = PTHREAD_MUTEX_INITIALIZER;
assert(hctl);
assert(hctl->compare);
INIT_LIST_HEAD(&hctl->elems);
qsort(hctl->pelems, hctl->count, sizeof(*hctl->pelems), compar);
pthread_mutex_lock(&sync_lock);
compare_hctl = hctl;
qsort(hctl->pelems, hctl->count, sizeof(*hctl->pelems), hctl_compare);
pthread_mutex_unlock(&sync_lock);
for (k = 0; k < hctl->count; k++)
list_add_tail(&hctl->pelems[k]->list, &hctl->elems);
}