Windows multithreading (i) Creating Threads CreateThread

The thread creates the function CreateThread1. Function Prototypes:

    HANDLE WINAPI CreateThread(      _In_opt_  LPSECURITY_ATTRIBUTES  lpThreadAttributes,         _In_      SIZE_T                 dwStackSize,      _In_      LPTHREAD_START_ROUTINE lpStartAddress,      _In_opt_  LPVOID                 lpParameter,      _In_      DWORD                  dwCreationFlags,      _Out_opt_ LPDWORD                lpThreadId    );

2. Parameter Description:

• The first parameter lpThreadAttributes represents the security properties of the thread kernel object, and a general pass-through of NULL means that the default setting is used.

• The second parameter dwStackSize represents the size of the line stacks space. Passing in 0 means using the default size (1MB).

• The third parameter lpStartAddress represents the address of the thread function that the new thread executes, and multiple threads can use the same function address.

• The fourth parameter lpParameter is a parameter passed to the thread function.

• The fifth parameter dwCreationFlags specifies an additional flag to control the creation of the thread, 0 indicates that the thread is ready to be dispatched immediately after it is created, and if create_suspended indicates that the thread is created and paused, it cannot be dispatched until ResumeThread () is called.

• The sixth parameter lpThreadId returns the ID number of the thread, and passing in null means that the thread ID number is not required to be returned.

3. Return value

Thread creation successfully returns a handle to the new thread, failure returns null

Two examples

/* create the first thread. The thread is revoked when the main process ends. */  #include <windows.h>   #include <stdio.h>  DWORD WINAPI ThreadFunc (LPVOID);    void  Main () {HANDLE hthread;    DWORD threadId; Hthread = CreateThread (NULL, 0 , ThreadFunc, 0 , 0 , &threadid); //create thread  printf ( "I am the main thread, PID =%d  \n  , GetCurrentThreadID ());    //output main thread pid  Sleep (2000 );} DWORD WINAPI ThreadFunc (LPVOID p) {printf ( "I am a child thread, PID =%d  \n   ", GetCurrentThreadID ());    //output sub-thread PID  return  0 ;}  

The function of this program is very simple, the main thread to create a threads, while the main thread and child threads to the console output the PID of the thread, such as:

Windows multithreading (i) Creating Threads CreateThread