POSIX之Thread-Specific Data

#ifdef _WRS_KERNEL
#define _POSIX_THREAD_KEYS_MAX 256     
#else
#define _POSIX_THREAD_KEYS_MAX 128
#endif

/*
 * 创建一个Thread-Specific Data, 存于<pKey>, 其值为NULL.
 * 如果数量超过_POSIX_THREAD_KEYS_MAX, 则返回EAGAIN(11).
 *
 * 线程终止时, 非NULL的<destructor>将被调用, 入参为Thread-Specific Data
 *
 * 当所有线程都不使用这个key时, User应该调用pthread_key_delete()
 */
int pthread_key_create
    (
    pthread_key_t *pKey,
    void (*destructor)(void *)
    );
/*
 * 删除Thread-Specific Data <key>,
 * 这里不会调用<destructor>.
 */
int pthread_key_delete
    (
    pthread_key_t key
    );
/*
 * 设置当前线程的Thread-Specific Data <key>的值为<value>.
 * 如果<value>为NULL,则后续的<destructor>不被调用.
 */
int pthread_setspecific
    (
    pthread_key_t key,
    void *value
    );
/*
 * 返回当前线程的Thread-Specific Data <key>的值.
 */
void *pthread_getspecific
    (
    pthread_key_t key
    );

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

static pthread_key_t bufKey;

void *subThread(void *args)
{
    char *buf = calloc(30, 1);
    pthread_setspecific(bufKey, buf);
    sprintf(buf, "thread %#x stops\n", (UINT32)pthread_self());
    return NULL;
    }
void threadStop(void *buf)
{
    printf(buf);
    free(buf);
    }

#ifdef _WRS_KERNEL
int testThread()
#else
int main()
#endif
{
    pthread_t tid1; 
    pthread_t tid2; 
    pthread_key_create(&bufKey, threadStop);

    pthread_create(&tid1, NULL, subThread, NULL);
    pthread_create(&tid2, NULL, subThread, NULL);
    pthread_join(tid1, NULL);
    pthread_join(tid2, NULL);

    pthread_key_delete(bufKey);
    return 0; 
    }