Linux C 为线程添加各自的日志文件

/* *============================================================================== * Filename    :  tsd.c * Description :   * Author      :  RollStone (rs), [e-mail] * Created     :  10/14/2014 15:14 * Copyright   :  2007-2014 RollStone. All Rights Reserved.  * Last_Change :  2014-10-14 15:53:05 * Version     :  1.0 *============================================================================== */#include <malloc.h>#include <pthread.h>#include <stdio.h>/* The key used to associate a log file pointer with each thread. */static pthread_key_t thread_log_key;void write_to_thread_log (const char* message);/* Write MESSAGE to the log file for the current thread. */void close_thread_log (void* thread_log);/* Close the log file pointer THREAD_LOG. */void* thread_function (void* args);int main (){int i;pthread_t threads[5];/* Create a key to associate thread log file pointers in   thread-specific data. Use close_thread_log to clean up the file   pointers. */pthread_key_create (&thread_log_key, close_thread_log);/* Create threads to do the work. */for (i = 0; i < 5; ++i){pthread_create (&(threads[i]), NULL, thread_function, NULL);}/* Wait for all threads to finish. */for (i = 0; i < 5; ++i){pthread_join (threads[i], NULL);}return 0;}void write_to_thread_log (const char* message){FILE* thread_log = (FILE*) pthread_getspecific (thread_log_key);fprintf (thread_log, "%s\n", message);}void close_thread_log (void* thread_log){fclose ((FILE*) thread_log);}void* thread_function (void* args){char thread_log_filename[20];char wbuf[64]={0};FILE* thread_log;/* Generate the filename for this thread’s log file. */int sf=(int)pthread_self();sprintf (thread_log_filename, "thread%d.log", sf);sprintf (wbuf, "Thread %d starting", sf);/* Open the log file. */thread_log = fopen (thread_log_filename, "w");/* Store the file pointer in thread-specific data under thread_log_key. */pthread_setspecific (thread_log_key, thread_log);write_to_thread_log (wbuf);/* Do work here... */return NULL;}