linux多线程问题
- C/C++ code
#include <iostream>#include <pthread.h>#include <unistd.h>#include <signal.h>#include <stdlib.h>#include <stdio.h>#include <errno.h>using namespace std;pthread_t pid;pthread_mutex_t mutex;void sig_handler(int sig){ cerr << "handle signal" << endl; if (sig == SIGUSR1) pthread_exit((void*)0);}void th_clean(void* arg){ cerr << "th_f exit" << endl;}/*通过信号终止的处理函数*/void* f(void* arg){ int oldstate; if (pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, &oldstate) ) cerr << "setcancel failed!" << endl; int i = 0; pthread_cleanup_push(th_clean, NULL); if (signal(SIGUSR1, sig_handler) == SIG_ERR) cerr << "signal failed!" << endl; pthread_mutex_lock(&mutex); while(1) { if (i == 100) i /= 100; i++; //usleep(10); [size=24px] [b][color=#FF0000] //测试通过信号利用pthread_exit来终止线程是否成功，但发现不加usleep(10)时会出现 //terminate called without an active exception 然后程序崩溃。[/color][/b][/size] } pthread_mutex_unlock(&mutex); cerr << "unlock mutex!" << endl; pthread_cleanup_pop(1); return (void*)0;}/* 发信号的线程函数*/void* f2(void* arg){ int kill_rc; while (1) { kill_rc = pthread_kill(pid, SIGUSR1); if (kill_rc == 0) { cerr << "signal send success" << endl; break; } else if (kill_rc == EINVAL) break; } cerr << "signal sound" << endl; sleep(20); return (void*)0;}int main(){ pthread_t pidf2; pthread_mutex_init(&mutex, NULL); pthread_create(&pid, NULL, f, NULL); sleep(5); pthread_create(&pidf2, NULL, f2, NULL); pthread_join(pidf2, NULL); pthread_join(pid, NULL); pthread_mutex_destroy(&mutex); cerr << "main exit" << endl; return 0;}[color=#FF0000] //测试通过信号利用pthread_exit来终止线程是否成功，但发现不加usleep(10)时会出现
//terminate called without an active exception 然后程序崩溃。
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[解决办法]
增加一个全局变量int g_sigflag = 0;
修改一下while循环试试
while( g_sigflag == 0 )
{
if (i == 100)
i /= 100;
i++;
}
同时修改一下信号处理函数
void sig_handler(int sig)
{
cerr << "handle signal" << endl;
if (sig == SIGUSR1)
g_sigflag = 1;
}
[解决办法]