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58 lines
2.5 KiB
58 lines
2.5 KiB
4 years ago
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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void *print_message_function( void *ptr );
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int main()
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{
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pthread_t thread1, thread2;
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char *message1 = "Thread 1";
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char *message2 = "Thread 2";
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int iret1, iret2;
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/* Create independent threads each of which will execute function */
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iret1 = pthread_create( &thread1, NULL, print_message_function, (void*) message1);
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iret2 = pthread_create( &thread2, NULL, print_message_function, (void*) message2);
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/*
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Arguments:
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thread - returns the thread id. (unsigned long int defined in bits/pthreadtypes.h)
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attr - Set to NULL if default thread attributes are used.
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void * (*start_routine) - pointer to the function to be threaded. Function has a single argument: pointer to void.
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*arg - pointer to argument of function. To pass multiple arguments, send a pointer to a structure.
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The following is a list of "thread attributes" and their default values
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Attribute Default Meaning of default
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contentionscope PTHREAD_SCOPE_PROCESS Thread will compete for resources within the process
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detachstate PTHREAD_CREATE_JOINABLE Thread is joinable by other threads
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stackaddr NULL Workspace (stack) used by thread is allocated (reserved) by the operating system
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stacksize NULL Workspace size used by thread is determined by the operating system
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priority 0 Priority of the thread (the lower the priority value, the higher the priority...)
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policy SCHED_OTHER The scheduling policy is determined by the system
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inheritsched PTHREAD_EXPLICIT_SCHED scheduling policy and parameters are not inherited but explicitly defined by the attribute object
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guardsize PAGESIZE size of guard area for a thread's created stack (this area will help determine if the thread has exceeded the total amount of space that was allocated for the thread)
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See https://man7.org/linux/man-pages/man3/pthread_create.3.html
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*/
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/* Wait till threads are complete before main continues. Unless we */
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/* wait we run the risk of executing an exit which will terminate */
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/* the process and all threads before the threads have completed. */
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pthread_join( thread1, NULL);
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pthread_join( thread2, NULL);
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printf("Thread 1 returns: %d\n",iret1);
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printf("Thread 2 returns: %d\n",iret2);
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pthread_exit(NULL);
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}
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void *print_message_function( void *ptr )
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{
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char *message;
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message = (char *) ptr;
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printf("%s \n", message);
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}
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