musl/src/thread/pthread_mutex_init.c

#include "pthread_impl.h"

int pthread_mutex_init(pthread_mutex_t *restrict m, const pthread_mutexattr_t *restrict a)
{
	*m = (pthread_mutex_t){0};
	if (a) m->_m_type = *a & 7;
	return 0;
}
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`#include "pthread_impl.h"`

use restrict everywhere it's required by c99 and/or posix 2008 to deal with the fact that the public headers may be used with pre-c99 compilers, __restrict is used in place of restrict, and defined appropriately for any supported compiler. we also avoid the form [restrict] since older versions of gcc rejected it due to a bug in the original c99 standard, and instead use the form *restrict. 2012-09-06 22:44:55 -04:00			`int pthread_mutex_init(pthread_mutex_t restrict m, const pthread_mutexattr_t restrict a)`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`{`
clean up sloppy nested inclusion from pthread_impl.h this mirrors the stdio_impl.h cleanup. one header which is not strictly needed, errno.h, is left in pthread_impl.h, because since pthread functions return their error codes rather than using errno, nearly every single pthread function needs the errno constants. in a few places, rather than bringing in string.h to use memset, the memset was replaced by direct assignment. this seems to generate much better code anyway, and makes many functions which were previously non-leaf functions into leaf functions (possibly eliminating a great deal of bloat on some platforms where non-leaf functions require ugly prologue and/or epilogue). 2012-11-08 17:04:20 -05:00			`*m = (pthread_mutex_t){0};`
implement robust mutexes some of this code should be cleaned up, e.g. using macros for some of the bit flags, masks, etc. nonetheless, the code is believed to be working and correct at this point. 2011-03-17 20:41:37 -04:00			`if (a) m->_m_type = *a & 7;`
initial check-in, version 0.5.0 2011-02-12 00:22:29 -05:00			`return 0;`
			`}`