4. API 比较细节

4.2.4 线索说明数据

• Solaris API

#include <thread.h>

int thr_keycreate (thread_key_t *keyp, void (*destructor) (void *))

int thr_setspecific (thread_key_t key, void *value)

int thr_getspecific (thread_key_t key, void **value)

• pthreads API

#include <pthread.h>

int pthread_key_create (pthread_key_t *keyp, void (*destructor) (void *))

int pthread_setspecific (pthread_key_t key, void *value) void * pthread_getspecific (pthread_key_t key)

int pthread_key_delete (pthread_key_t key)



• 关键字创建

在Solaris 中

thread_key_t mykey;

int ret;

ret = thr_keycreate (&mykey, NULL); /* key create without destructor */

ret = thr_keycreate (&mykey, dest_func); /* key create with destructor */

在pthreads 中

pthread_key_t mykey;

int ret;

ret = pthread_key_create (&mykey, NULL); /* key create without destructor */

ret = pthread_key_create (&mykey, dest_func); /* key create with destructor */

• 得到TSD

在Solaris 中

thread_key_t mykey;

void *val;

int ret;

ret = thr_getspecific (mykey, &val); /* mykey is previously created key */

在pthreads 中

pthread_key_t mykey;

void *val;

val = pthread_getspecific (mykey); /* mykey is previously created key */

• 设置TSD

在Solaris 中

thread_key_t mykey;

void *val;

int ret;

ret = thr_setspecific (mykey, val); /* mykey is previously created key */

在pthreads 中

pthread_key_t mykey;

void *val;

int ret;

ret = pthread_setspecific (mykey, val); /* mykey is previously created key */

• 关键字删除

pthreads 提供一种方法，以释放一个已存在的线索说明数据关键字。当试图访问一些不再有效的线索说明数据集时，使用它会引起错误返回。在Solaris 中没有可比较的函数。

一旦删除了一个关键字，通过pthread_setspecific() 或者pthread_getspecific() 对它的引用，导致EINVAL错。程序员负责在调用删除函数前释放任何线索说明资源。此函数不嵌入任何解构器。

pthread_key_t mykey;

int ret;

ret = pthread_key_delete (mykey); /* mykey is previously created key */

Copyright: NPACT