PTHREAD_CREATE(3) BSD Library Functions Manual PTHREAD_CREATE(3)
pthread_create -- create a new thread
POSIX Threads Library (libpthread, -lpthread)
pthread_create(pthread_t * restrict thread, const pthread_attr_t * restrict attr,
void *(*start_routine)(void *), void * restrict 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.
The attributes specified via attr are copied into the new thread. Any subsequent modifica-
tions to the attributes object attr points to will have no effect upon already-created
threads. It is thus also safe to pass the same attr to multiple calls to pthread_create().
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
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:
o The signal mask is inherited from the creating thread.
o The set of signals pending for the new thread is empty.
If successful, the pthread_create() function will return zero. Otherwise an error number
will be returned to indicate the error.
pthread_create() shall fail if:
[EAGAIN] The system lacks 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.
[EINVAL] The value specified by attr is invalid.
fork(2), pthread_attr(3), pthread_cleanup_pop(3), pthread_cleanup_push(3), pthread_exit(3),
The function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').
BSD July 9, 2010 BSD