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/* $OpenBSD: rthread_libc.c,v 1.18 2017/05/27 14:20:39 mpi Exp $ */
/* PUBLIC DOMAIN: No Rights Reserved. Marco S Hyman <marc@snafu.org> */
#include <sys/time.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include "thread_private.h" /* in libc/include */
#include "rthread.h"
#include "rthread_cb.h"
/*
* A thread tag is a pointer to a structure of this type. An opaque
* tag is used to decouple libc from the thread library.
*/
struct _thread_tag {
pthread_mutex_t m; /* the tag's mutex */
pthread_key_t k; /* a key for private data */
};
/*
* local mutex to protect against tag creation races.
*/
static pthread_mutex_t _thread_tag_mutex = PTHREAD_MUTEX_INITIALIZER;
/*
* Initialize a thread tag structure once. This function is called
* if the tag is null. Allocation and initialization are controlled
* by a mutex. If the tag is not null when the mutex is obtained
* the caller lost a race -- some other thread initialized the tag.
* This function will never return NULL.
*/
static void
_thread_tag_init(void **tag)
{
struct _thread_tag *tt;
int result;
result = pthread_mutex_lock(&_thread_tag_mutex);
if (result == 0) {
if (*tag == NULL) {
tt = malloc(sizeof *tt);
if (tt != NULL) {
result = pthread_mutex_init(&tt->m, NULL);
result |= pthread_key_create(&tt->k, free);
*tag = tt;
}
}
result |= pthread_mutex_unlock(&_thread_tag_mutex);
}
if (result != 0)
_rthread_debug(1, "tag init failure");
}
/*
* lock the mutex associated with the given tag
*/
void
_thread_tag_lock(void **tag)
{
struct _thread_tag *tt;
if (__isthreaded) {
if (*tag == NULL)
_thread_tag_init(tag);
tt = *tag;
if (pthread_mutex_lock(&tt->m) != 0)
_rthread_debug(1, "tag mutex lock failure");
}
}
/*
* unlock the mutex associated with the given tag
*/
void
_thread_tag_unlock(void **tag)
{
struct _thread_tag *tt;
if (__isthreaded) {
if (*tag == NULL)
_thread_tag_init(tag);
tt = *tag;
if (pthread_mutex_unlock(&tt->m) != 0)
_rthread_debug(1, "tag mutex unlock failure");
}
}
/*
* return the thread specific data for the given tag. If there
* is no data for this thread initialize it from 'storage'.
* On any error return 'err'.
*/
void *
_thread_tag_storage(void **tag, void *storage, size_t sz, void *err)
{
struct _thread_tag *tt;
void *ret;
if (*tag == NULL)
_thread_tag_init(tag);
tt = *tag;
ret = pthread_getspecific(tt->k);
if (ret == NULL) {
ret = malloc(sz);
if (ret == NULL)
ret = err;
else {
if (pthread_setspecific(tt->k, ret) == 0)
memcpy(ret, storage, sz);
else {
free(ret);
ret = err;
}
}
}
return ret;
}
void
_thread_mutex_lock(void **mutex)
{
pthread_mutex_t *pmutex = (pthread_mutex_t *)mutex;
if (pthread_mutex_lock(pmutex) != 0)
_rthread_debug(1, "mutex lock failure");
}
void
_thread_mutex_unlock(void **mutex)
{
pthread_mutex_t *pmutex = (pthread_mutex_t *)mutex;
if (pthread_mutex_unlock(pmutex) != 0)
_rthread_debug(1, "mutex unlock failure");
}
void
_thread_mutex_destroy(void **mutex)
{
pthread_mutex_t *pmutex = (pthread_mutex_t *)mutex;
if (pthread_mutex_destroy(pmutex) != 0)
_rthread_debug(1, "mutex destroy failure");
}
/*
* the malloc lock
*/
#ifndef FUTEX
#define MALLOC_LOCK_INITIALIZER(n) { \
_SPINLOCK_UNLOCKED, \
TAILQ_HEAD_INITIALIZER(malloc_lock[n].lockers), \
PTHREAD_MUTEX_DEFAULT, \
NULL, \
0, \
-1 }
#else
#define MALLOC_LOCK_INITIALIZER(n) { \
_SPINLOCK_UNLOCKED, \
PTHREAD_MUTEX_DEFAULT, \
NULL, \
0, \
-1 }
#endif
static struct pthread_mutex malloc_lock[_MALLOC_MUTEXES] = {
MALLOC_LOCK_INITIALIZER(0),
MALLOC_LOCK_INITIALIZER(1),
MALLOC_LOCK_INITIALIZER(2),
MALLOC_LOCK_INITIALIZER(3)
};
static pthread_mutex_t malloc_mutex[_MALLOC_MUTEXES] = {
&malloc_lock[0],
&malloc_lock[1],
&malloc_lock[2],
&malloc_lock[3]
};
void
_thread_malloc_lock(int i)
{
pthread_mutex_lock(&malloc_mutex[i]);
}
void
_thread_malloc_unlock(int i)
{
pthread_mutex_unlock(&malloc_mutex[i]);
}
void
_thread_malloc_reinit(void)
{
int i;
for (i = 0; i < _MALLOC_MUTEXES; i++) {
malloc_lock[i].lock = _SPINLOCK_UNLOCKED;
#ifndef FUTEX
TAILQ_INIT(&malloc_lock[i].lockers);
#endif
malloc_lock[i].owner = NULL;
malloc_lock[i].count = 0;
}
}
/*
* atexit lock
*/
static _atomic_lock_t atexit_lock = _SPINLOCK_UNLOCKED;
void
_thread_atexit_lock(void)
{
_spinlock(&atexit_lock);
}
void
_thread_atexit_unlock(void)
{
_spinunlock(&atexit_lock);
}
/*
* atfork lock
*/
static _atomic_lock_t atfork_lock = _SPINLOCK_UNLOCKED;
void
_thread_atfork_lock(void)
{
_spinlock(&atfork_lock);
}
void
_thread_atfork_unlock(void)
{
_spinunlock(&atfork_lock);
}
/*
* arc4random lock
*/
static _atomic_lock_t arc4_lock = _SPINLOCK_UNLOCKED;
void
_thread_arc4_lock(void)
{
_spinlock(&arc4_lock);
}
void
_thread_arc4_unlock(void)
{
_spinunlock(&arc4_lock);
}
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