create a new thread
() function is used to
create a new thread, with attributes specified by
, within a process. If
is NULL, the default attributes are
used. If the attributes specified by attr
modified later, the thread's attributes are not affected. Upon successful
() will store the
ID of the created thread in the location specified by
The thread is created executing start_routine
as its sole argument. If the
returns, the effect is as if
there was an implicit call to
() using the return value of
as the exit status. Note that
the thread in which
() was originally
invoked differs from this. When it returns from
(), the effect is as if there was an
implicit call to
() using the return
() as the exit status.
The signal state of the new thread is initialized as:
- The signal mask is inherited from the creating thread.
- The set of signals pending for the new thread is empty.
If successful, the
will return zero. Otherwise an error number will be returned to indicate the
() will fail if:
- 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.
- The value specified by attr is
() conforms to