Does Linux have a function to create threads?

Linux has a function to create threads, namely the "pthread_create()" function. This function is a function that creates threads in Unix-like operating systems. It supports four parameters: parameter 1 is a pointer to the thread identifier, parameter 2 is used to set thread attributes, parameter 3 is the starting address of the thread running function, and parameter 4 is Parameters to run the function.

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

Linux has a function to create threads, which is the pthread_create() function.

pthread_create() is a function that creates threads in Unix-like operating systems (Unix, Linux, Mac OS X, etc.)

Header file

# includecc7ade6c52b5948d3b8647c25104afae

Function declaration

int pthread_create( pthread_t *restrict tidp, //新创建的线程ID指向的内存单元。 const pthread_attr_t *restrict attr, //线程属性，默认为NULL void *(*start_rtn)(void *), //新创建的线程从start_rtn函数的地址开始运行 void *restrict arg //默认为NULL。上述函数需要参数，将参数放入结构中并将地址作为arg传入。 );

Return value

• ##If successful, return 0, otherwise return error number

Parameters

• The first parameter is a pointer to the thread identifier.

• The second parameter is used to set thread attributes.

• The third parameter is the address of the thread running function.

• The last parameter is the parameter to run the function.

Note

Pay attention to adding the -lpthread parameter when compiling to call the static link library. Because pthread is not the default library for Linux systems.

Function usage

#include  #include  #include  #include  #include  #include  #include "main.h" using namespace std; struct Sample { uint32_t index; char sex; uint32_t age; uint32_t result; }; void* TaskEntry(void *args) { Sample *sa = (Sample*)args; uint32_t num = sa->index; if (num == 0) { printf("TaskEntry entry num = 0\n"); // 线程1执行体 sleep(10); printf("TaskEntry entry num = 0 is over!!!\n"); } else if (num == 1) { printf("TaskEntry entry num = 1\n"); // 线程2执行体 sleep(10); printf("TaskEntry entry num = 1 is over!!!\n"); } else if (num == 2) { printf("TaskEntry entry num = 2\n"); // 线程3执行体 sleep(2); printf("TaskEntry entry num = 2 is over!!!\n"); } } uint32_t CreateTask(pthread_t& pid, Sample& sample) { // 假设Sample.index == 2创建任务失败，直接返回 if (sample.index == 2) { return 2; } pthread_attr_t attr; // 设置线程属性 pthread_attr_init(&attr); pthread_attr_setstacksize(&attr, 64 * 1024); // 设置线程栈大小为64KB uint32_t ret = pthread_create(&pid, &attr, (void*(*)(void*))TaskEntry, (void*)&sample); if (ret != 0) { return ret; } pthread_attr_destroy(&attr); // 取消线程的设置属性 return 0; } void VerifyTask(vector& taskID, vector& taskArgs) { void *ret; for (int index = 0; index<2; index++) { // 等待线程结束，释放相应的资源。pthread_join会堵塞主线程不会堵塞其他子线程，然后等待监控的线程执行完成，再返回主线程 // 在此处线程执行顺序为：线程1--主线程--线程2--主线程--线程3 pthread_join(taskID[index], &ret); // 堵塞主线程，执行子线程taskID[index]，等待子线程taskID[index]执行完成释放资源 printf("task[%d] is over\n", index); // 主线程执行打印操作 } } int main(void) { // 创建3个线程 vector taskID(3); vector taskArgs(3); for (int i = 0; i < 3; i++) { taskArgs[i] = { i, 'a', 90, 0}; uint32_t ret = CreateTask(taskID[i], taskArgs[i]); if (ret != 0) { // 模拟如下场景：任务创建失败，直接停止前面的任务 for (int j = 0; j
      
Note that when using compilation, you need to add the compilation option -lpthread, for example: g -lpthread main.cpp -o main
      
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