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/*
* tsd.c
*
* Description:
* POSIX thread functions which implement thread-specific data (TSD).
*/
/*
* Why we can't use Win32 TLS
* --------------------------
*
* In a word: Destructors
*
* POSIX 1003.1 1996, Section 17 allows for optional destructor functions
* to be associated with each key value. The destructors are called from
* the creating thread, which means that the calling thread must have access
* to the TSD keys of all active threads.
*
* If we use Win32 TLS then this is not possible since Tls*Value()
* functions don't allow us to access other than our own [thread's] key.
*
* As a result, these routines need to be redesigned.
*/
#include <errno.h>
#include "pthread.h"
#include "implement.h"
int
pthread_key_create(pthread_key_t *key, void (*destructor)(void *))
{
DWORD index;
index = TlsAlloc();
if (index == 0xFFFFFFFF)
{
return EAGAIN;
}
/* Only modify the `key' parameter if allocation was successful. */
*key = index;
if (destructor != NULL)
{
return (_pthread_destructor_push(destructor, *key));
}
return 0;
}
int
pthread_setspecific(pthread_key_t key, void *value)
{
return (TlsSetValue(key, value) == FALSE) ? EINVAL : 0;
}
void *
pthread_getspecific(pthread_key_t key)
{
return TlsGetValue(key);
}
int
pthread_key_delete(pthread_key_t key)
{
/* Remove this key's destructors. */
_pthread_destructor_pop(key);
return (TlsFree(key) == FALSE) ? EINVAL : 0;
}
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