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/* $OpenBSD: thread_storage.c,v 1.4 2002/11/03 20:36:43 marc Exp $ */
/* Public Domain */
/*
* libpthread's stronger functions
*/
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
#include "pthread_private.h"
void
_libc_private_storage_lock(mutex)
pthread_mutex_t *mutex;
{
if (__isthreaded && pthread_mutex_lock(mutex) != 0)
PANIC("_libc_private_storage_lock");
}
void
_libc_private_storage_unlock(mutex)
pthread_mutex_t *mutex;
{
if (__isthreaded && pthread_mutex_unlock(mutex) != 0)
PANIC("_libc_private_storage_unlock");
}
void *
_libc_private_storage(volkey, init, initsz, error)
volatile struct _thread_private_key_struct * volkey;
void * init;
size_t initsz;
void * error;
{
void *result;
void (*cleanfn)(void *);
struct _thread_private_key_struct * key;
/* Use static storage while not threaded: */
if (!__isthreaded)
return init;
key = (struct _thread_private_key_struct *)volkey; /* for gcc */
/* Create the key once: */
if (volkey->once.state == PTHREAD_NEEDS_INIT) {
if (pthread_mutex_lock(&key->once.mutex) != 0)
return error;
if (volkey->once.state == PTHREAD_NEEDS_INIT) {
if (key->cleanfn == NULL)
cleanfn = free;
else
cleanfn = key->cleanfn;
if (pthread_key_create(&key->key, cleanfn) != 0) {
pthread_mutex_unlock(&key->once.mutex);
return error;
}
key->once.state = PTHREAD_DONE_INIT;
}
pthread_mutex_unlock(&key->once.mutex);
}
/* XXX signals may cause re-entrancy here? */
/* Acquire this key's thread-specific storage: */
result = pthread_getspecific(key->key);
/* Allocate and initialise storage if unallocated: */
if (result == NULL) {
result = malloc(initsz);
if (result == NULL)
return error;
if (pthread_setspecific(key->key, result) != 0) {
free(result);
return error;
}
memcpy(result, init, initsz);
}
return result;
}
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