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PTHREAD_CREATE(3) Library Functions Manual PTHREAD_CREATE(3)

pthread_create
create a new thread

#include <pthread.h>
int
pthread_create(pthread_t *thread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg);

The pthread_create() function is used to create a new thread, with attributes specified by attr, within a process. If attr is NULL, the default attributes are used. If the attributes specified by attr are modified later, the thread's attributes are not affected. Upon successful completion pthread_create() will store the ID of the created thread in the location specified by thread.
The thread is created executing start_routine with arg as its sole argument. If the start_routine returns, the effect is as if there was an implicit call to pthread_exit() using the return value of start_routine as the exit status. Note that the thread in which main() was originally invoked differs from this. When it returns from main(), the effect is as if there was an implicit call to exit() using the return value of main() as the exit status.
The signal state of the new thread is initialized as:

If successful, the pthread_create() function will return zero. Otherwise an error number will be returned to indicate the error.

pthread_create() will fail if:
 
 
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The system lacked the necessary resources to create another thread, or the system-imposed limit on the total number of threads in a process [PTHREAD_THREADS_MAX] would be exceeded.
 
 
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The value specified by attr is invalid.

__tfork(3), pthread_attr_init(3), pthread_attr_setdetachstate(3), pthread_attr_setguardsize(3), pthread_attr_setstack(3), pthread_attr_setstackaddr(3), pthread_attr_setstacksize(3), pthread_cleanup_pop(3), pthread_cleanup_push(3), pthread_exit(3), pthread_join(3)

pthread_create() conforms to ISO/IEC 9945-1:1996 (“POSIX.1”).
March 30, 2016 OpenBSD-current