C pthread之间的信号处理
我试图学习进程和线程之间的信号处理。回答几个问题会帮助我更好地理解它 我知道一个进程可以向进程组发送信号,并允许多个进程接收相同的信号,但我不确定线程C pthread之间的信号处理,c,multithreading,pthreads,signals,signal-handling,C,Multithreading,Pthreads,Signals,Signal Handling,我试图学习进程和线程之间的信号处理。回答几个问题会帮助我更好地理解它 我知道一个进程可以向进程组发送信号,并允许多个进程接收相同的信号,但我不确定线程 多个pthread能否同时处理发送到所有pthread的信号 我将程序设置为使用阻止所有信号,我有两个线程用于等待信号,我让主线程发送SIGUSR1信号。当只有一个线程处理信号时(我在另一个线程中注释掉代码),似乎一切都很好,但是当两个线程都运行sigwait()代码时,它挂起或终止得太快 代码粘贴在下面 sig_atomic_t signa
- 多个pthread能否同时处理发送到所有pthread的信号
sigwait()
代码时,它挂起或终止得太快
代码粘贴在下面
sig_atomic_t signals = 0;
sig_atomic_t sigusr1_signals = 0;
sig_atomic_t sigusr2_signals = 0;
sig_atomic_t count = 0;
sig_atomic_t totalcount = 0;
sigset_t globalset;
int WAIT = 1; /* false = 0, true = 1 */
static int SIGNALS_SENT = 0;
static int SIGNALS_RECEIVED = 0;
void *sig1handler1(void *argv);
void *reporterhandler(void *argv);
int random_number(int min, int max);
int main(void) {
pthread_t threads[2]; /* create an array to store a number of threads */
//int *p_status = &status;
sigfillset(&globalset);
pthread_sigmask(SIG_BLOCK, &globalset, NULL);
/* Generate signal handling threads */
if (pthread_create(&threads[0], NULL, &sig1handler1, NULL) > 0)
{
printf("Thread creation failure!\n");
return -1;
}
/* create reporting thread */
if (pthread_create(&threads[1], NULL, &reporterhandler, NULL) > 0)
{
printf("Thread creation failure!\n");
return -1;
}
/* Signal all threads to begin work concurrently */
WAIT = 0;
int c = 0;
while(c < 100)
{
int value = random_number(1, 2);
if (value == 1)
kill(0, SIGUSR1);
else
kill(0, SIGUSR2);
SIGNALS_SENT++;
c++;
usleep(10000);
}
kill(0, SIGINT);
/* Wait for each thread to finish and join */
int i = 0;
for(i = 0; i < 2; i++)
{
if (pthread_join(threads[i], NULL) > 0)
{
printf("Thread [%u] join failure!\n", (unsigned int)threads[i]);
return -1;
}
printf("THREAD [%u] returned.\n", (unsigned int)threads[i]);
}
printf("Parent Process [%d] exiting successfully.\n", getpid());
return EXIT_SUCCESS;
}
void *sig1handler1(void *argv)
{
pthread_t tid = pthread_self();
printf("THREAD[%u] sig1handler1: waiting for signal to do some work...\n", (unsigned int)tid);
// sigset_t myset;
// sigfillset(&myset);
// sigdelset(&myset, SIGINT);
// sigdelset(&myset, SIGUSR1);
// pthread_sigmask(SIG_SETMASK, &myset, NULL);
/* Wait for a signal to start work */
while (WAIT);
int sig;
int count = 0;
while(1)
{
sigwait(&globalset, &sig);
if (sig == SIGUSR1)
{
sigusr1_signals++;
signals++;
count++;
//printf("thread1: caught SIGUSR1 signal!\n");
}
else if (sig == SIGINT)
{
printf("thread1: caught SIGINT signal, detected SIGUSR1 %d times, and terminating!\n", count); pthread_exit(NULL);
}
}
//printf("THREAD[%u] sig1handler1: doing some work!\n", (unsigned int)tid);
//return (void *)EXIT_SUCCESS;
//return (void *)NULL;
pthread_exit(NULL);
}
void *reporterhandler(void *argv)
{
pthread_t tid = pthread_self();
printf("THREAD[%u] reporter: waiting for signal to do some work...\n", (unsigned int)tid);
int sig;
int count = 0;
// sigset_t myset;
// sigfillset(&myset);
// sigdelset(&myset, SIGINT);
// sigdelset(&myset, SIGUSR1);
// sigdelset(&myset, SIGUSR2);
// pthread_sigmask(SIG_SETMASK, &myset, NULL);
/* Wait for a signal to start work */
while (WAIT);
while(1)
{
sigwait(&globalset, &sig);
if (sig == SIGUSR1)
{
sigusr1_signals++;
signals++;
count++;
totalcount++;
SIGNALS_RECEIVED++;
}
else if (sig == SIGUSR2)
{
sigusr2_signals++;
signals++;
count++;
totalcount++;
SIGNALS_RECEIVED++;
}
else if (sig == SIGINT)
{
printf("Reporter: SIGUSR1 detected %d times\n", sigusr1_signals);
printf("Reporter: SIGUSR2 detected %d times\n", sigusr2_signals);
printf("Reporter: detected %d signals\n", totalcount);
printf("Reporter: SIGNALS_SENT %d \n", SIGNALS_SENT);
printf("Reporter: SIGNALS_REC %d \n", SIGNALS_RECEIVED);
pthread_exit(NULL);
}
/* Display Report after detecting 10 signals */
if (count == 10)
sigusr1_signals, sigusr2_signals);
count = 0;
}
}
//printf("THREAD[%u] reporter: doing some work!\n", (unsigned int)tid);
pthread_exit(NULL);
}
int random_number(int min, int max)
{
if (min < max)
{
max = max + 1; /* include the max value */
return (rand() % (max - min)) + min;
}
return -1;
}
sig_原子信号=0;
sig_原子信号=0;
sig_原子信号t sigusr2_信号=0;
信号原子计数=0;
sig_原子总计数=0;
sigset_t globalset;
int WAIT=1;/*false=0,true=1*/
静态int信号_发送=0;
静态int信号_接收=0;
void*sig1handler1(void*argv);
void*报告处理程序(void*argv);
int随机数(int最小值,int最大值);
内部主(空){
pthread_t threads[2];/*创建一个数组来存储多个线程*/
//int*p_status=&status;
sigfillset(&globalset);
pthread_sigmask(SIG_块和globalset,NULL);
/*生成信号处理线程*/
if(pthread_create(&threads[0],NULL,&sig1handler1,NULL)>0)
{
printf(“线程创建失败!\n”);
返回-1;
}
/*创建报告线程*/
if(pthread_create(&threads[1],NULL,&reporterhandler,NULL)>0)
{
printf(“线程创建失败!\n”);
返回-1;
}
/*通知所有线程同时开始工作*/
等待=0;
int c=0;
而(c<100)
{
int值=随机数(1,2);
如果(值==1)
kill(0,SIGUSR1);
其他的
kill(0,SIGUSR2);
信号发送++;
C++;
美国LEEP(10000);
}
kill(0,SIGINT);
/*等待每个线程完成并连接*/
int i=0;
对于(i=0;i<2;i++)
{
if(pthread_join(threads[i],NULL)>0)
{
printf(“线程[%u]连接失败!\n”,(未签名int)线程[i]);
返回-1;
}
printf(“线程[%u]返回。\n”,(无符号int)线程[i]);
}
printf(“父进程[%d]成功退出。\n”,getpid());
返回退出成功;
}
void*sig1handler1(void*argv)
{
pthread_t tid=pthread_self();
printf(“线程[%u]sig1handler1:等待信号执行某些工作…\n”,(unsigned int)tid);
//sigset_t myset;
//sigfillset(&myset);
//sigdelset(&myset,SIGINT);
//sigdelset(&myset,SIGUSR1);
//pthread_sigmask(SIG_SETMASK,&myset,NULL);
/*等待信号开始工作*/
while(等待);
int-sig;
整数计数=0;
而(1)
{
sigwait(&globalset,&sig);
if(sig==SIGUSR1)
{
sigusr1_信号++;
信号++;
计数++;
//printf(“thread1:捕捉到的信号!\n”);
}
else if(sig==SIGINT)
{
printf(“线程1:捕捉到SIGINT信号,检测到SIGUSR1%d次,并终止!\n”,计数);pthread_退出(NULL);
}
}
//printf(“线程[%u]sig1handler1:正在做一些工作!\n”,(unsigned int)tid);
//返回(无效*)退出成功;
//返回(void*)空;
pthread_exit(NULL);
}
void*报告处理程序(void*argv)
{
pthread_t tid=pthread_self();
printf(“线程[%u]报告器:正在等待信号做一些工作…\n”,(unsigned int)tid);
int-sig;
整数计数=0;
//sigset_t myset;
//sigfillset(&myset);
//sigdelset(&myset,SIGINT);
//sigdelset(&myset,SIGUSR1);
//sigdelset(&myset,SIGUSR2);
//pthread_sigmask(SIG_SETMASK,&myset,NULL);
/*等待信号开始工作*/
while(等待);
而(1)
{
sigwait(&globalset,&sig);
if(sig==SIGUSR1)
{
sigusr1_信号++;
信号++;
计数++;
totalcount++;
信号_接收++;
}
else if(sig==SIGUSR2)
{
sigusr2_信号++;
信号++;
计数++;
totalcount++;
信号_接收++;
}
else if(sig==SIGINT)
{
printf(“报告者:SIGUSR1检测到%d次\n”,SIGUSR1\u信号);
printf(“报告者:SIGUSR2检测到%d次\n”,SIGUSR2\u信号);
printf(“报告器:检测到%d个信号\n”,totalcount);
printf(“报告者:信号发送%d\n”,信号发送);
printf(“报告者:接收到的信号%d\n”);
pthread_exit(NULL);
}
/*检测到10个信号后显示报告*/
如果(计数=10)
sigusr1_信号、sigusr2_信号);
计数=0;
}
}
//printf(“线程[%u]报告器:正在做一些工作!\n”,(unsigned int)tid);
pthread_exit(NULL);
}
整数随机数(整数最小值,整数最大值)
{
如果(最小值<最大值)
{
max=max+1;/*包括最大值*/
返回值(rand()%(max-min))+min;
}
返回-1;
}
- 信号[可以]发送到所有pthread[并且]可以由多个pthread同时处理吗
int pthread_kill(pthread_t thread, int sig);
在您的例子中,我认为向所有线程传递信号的唯一方法是沿着所有线程进行迭代