linux多线程demo
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博文原创，转载请声明出处
电子咖啡(原id蓝岩)
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from:http://programming-in-linux.blogspot.com/2008/03/multithreading-example-in-cc-using.html
在网上找到了一个linux多线程的demo，原博客已经删除了，我做了些注释编辑一下，希望对读者有用。
demo展示了如何创建线程，如何初始化，如何传递参数等。
thread_example.cc
#include <pthread.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#include <string.h>
//define a struct to pass parameters
typedef struct my_struct {
int data;
int random_number;
}my_struct_t;
/*=== define the thread method ======*/
void * thread(void * str) {
my_struct_t *local_str = (my_struct_t *)str;
int i;
for (i=0;i<5;i++) {
sleep(local_str->random_number);
printf("Hello! I am thread %d, i was sleeping for %d seconds\n",
local_str->data,
local_str->random_number);
}
}
/*===========================================================================*/
/*=== main method ====*/
int main(int argc, char **argv){
sigset_t oSignalSet;
//initialise and empty a signal set
sigemptyset(&oSignalSet);
sigaddset(&oSignalSet, SIGINT);
sigaddset(&oSignalSet, SIGABRT);
sigaddset(&oSignalSet, SIGQUIT);
pthread_sigmask(SIG_BLOCK, &oSignalSet, NULL);
pthread_t iThreadId;
//
// Declare variable to hold seconds on clock.
//
time_t seconds;
//
// Get value from system clock and
// place in seconds variable.
//
time(&seconds);
//
// Convert seconds to a unsigned
// integer.
//
srand((unsigned int) seconds);
my_struct_t st1;
my_struct_t st2;
my_struct_t st3;
st1.data = 1;
st2.data = 2;
st3.data = 3;
st1.random_number = rand()%10;
st2.random_number = rand()%10;
st3.random_number = rand()%10;
printf("Parent: Creating and calling threads...\n");
int iReturnValue1 = pthread_create(&iThreadId, NULL, &thread, (void *)&st1);
int iReturnValue2 = pthread_create(&iThreadId, NULL, &thread, (void *)&st2);
// pthread_cancel(iThreadId);
int iReturnValue3 = pthread_create(&iThreadId, NULL, &thread, (void *)&st3);
//cancel pThread
pthread_cancel(iThreadId);
if (iReturnValue1 < 0 || iReturnValue2 < 0 || iReturnValue2 < 0) {
printf("error creating thread '%s'.\n", strerror(errno));
}
int iSignalNumber;
sigwait(&oSignalSet, &iSignalNumber);
printf("exit after receiving signal #%d.\n", iSignalNumber);
exit(0);
}
编译运行：
ericyang$ g++ -o thread_example.o thread_example.cc ericyang$thread_example.o
输出结果：
Parent: Creating and calling threads... Hello! I am thread 2, i was sleeping for 1 seconds Hello! I am thread 2, i was sleeping for 1 seconds Hello! I am thread 2, i was sleeping for 1 seconds Hello! I am thread 1, i was sleeping for 4 seconds Hello! I am thread 2, i was sleeping for 1 seconds Hello! I am thread 2, i was sleeping for 1 seconds Hello! I am thread 1, i was sleeping for 4 seconds Hello! I am thread 1, i was sleeping for 4 seconds Hello! I am thread 1, i was sleeping for 4 seconds Hello! I am thread 1, i was sleeping for 4 seconds