我无法理解pthread_mutex_lock/unlock和pthread_cond_wait/等条件变量signal
我正在尝试创建 9 个threads，并让它们同时运行，以确定哪个是最有效的。
int threadNumber = 0;
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
#define NUM_THREADS 9
//used to store the information of each thread
typedef struct{
pthread_t threadID;
int policy;
struct sched_param param;
long startTime;
long taskStartTime;
long endTime1;
long endTime2;
long endTime3;
long runTime;
char startDate[30];
char endDate[30];
}ThreadInfo;
ThreadInfo myThreadInfo[NUM_THREADS];
//main function
int main(void){
printf("running...\n");
pthread_mutex_lock(&mutex); //lock the mutex//////
pthread_cond_wait(&cond, &mutex); //start waiting//////
int fifoPri = …我已经非常广泛地研究了一个shell,现在我正在尝试升级这个代码来报告一个孩子被信号终止的时候(SIGINT除外).我也试图报告"核心转储"如果一个括号(类似bash)的发生.
...
if(test == -1){
cpid = fork();
if(cpid < 0){
//Fork wasn't successful
perror("fork");
free(argList);
return -1;
}
if(cpid == 0){
//We are the child!
close(pipefd[0]);
dup2(pipefd[1], 1);
execvp(args[0], args);
//execvp returned, wasn't successful
perror("exec");
fclose(stdin);
exit(127);
}
close(pipefd[1]);
//Have the parent wait for child to complete, if flags allow
if(strcmp(flags, "NOWAIT") != 0){
if(wait (&status) < 0){
//Wait wasn't successful
perror("wait");
}
else{
////////////////////////////////////////////////////////
//report if a child has been terminated by a signal other than SIGINT
if((WIFSTOPPED(status) …