pthread——pthread_cleanup

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Pthread_cleanup用於註冊線程清理函數，註冊的清理函數將線上程被取消或者主動調用pthread_exit時被調用；

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一個簡單的樣本：

#include <pthread.h> #include <stdio.h> ? ? // pthread_cleanup_push and pthread_cleanup_pop should be called in pairs at the same lexical nesting level // they are implemented with ‘{‘ ‘}‘ ? // pthread_cleanup_pop with non-zero argument/pthread_cancel/pthread_exit // will cause the remained handler to be popped and executed ? #define ERROR printf("error @ %s line %d\n", __FILE__, __LINE__ ); ? void thread_cleanup( void *arg ) { // __func__ can be used instead printf("%s is called\n", __FUNCTION__ ); } ? void* threadfn( void *data ) { pthread_cleanup_push( thread_cleanup, NULL ); ? // sleep是一個可以執行線程取消的函數，稱為取消點【see man 7 pthreads】； sleep( 20 ); ? pthread_cleanup_pop( 1 ); } ? int main(int argc, char const *argv[]) { pthread_t thread; ? if ( pthread_create( &thread, NULL, threadfn, NULL) ) { ERROR; return -1; } ? sleep( 1 ); ? // cancel the thread before it exits if( pthread_cancel( thread ) ) { ERROR; return -1; } ? // wait for thread to complete it‘s cleanup if( pthread_join( thread, NULL ) ) { ERROR; return -1; } ? printf("Done!\n"); ? return 0; }

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pthread——pthread_cleanup