Date: Sun, 20 Jun 2010 01:52:22 -0700 From: Garrett Cooper <yanefbsd@gmail.com> To: standards@freebsd.org Subject: Question over POSIX compliancy of pthread_once_t Message-ID: <AANLkTinaZRQuNdKOpp-Ma50kHjbO45cOGq7ah521f9eS@mail.gmail.com>
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PTHREAD_ONCE_INIT / pthread_once_t isn't tersely defined according to
pthread(3) or sys/types.h at on the opengroup pages [1, 2, 3]
FreeBSD defines it as follows:
/usr/include/pthread.h:#define PTHREAD_ONCE_INIT { PTHREAD_NEEDS_INIT, NULL }
/* ... */
/*
* Once definitions.
*/
struct pthread_once {
int state;
pthread_mutex_t mutex;
};
glibc-2.7 has PTHREAD_ONCE_INIT defined differently [4]:
208 /* Single execution handling. */
209 #define PTHREAD_ONCE_INIT 0
I can't determine which one is semantically correct.
Thanks,
-Garrett
1. http://www.opengroup.org/onlinepubs/000095399/basedefs/pthread.h.html
2. http://www.opengroup.org/onlinepubs/000095399/functions/pthread_once.html
3. http://www.opengroup.org/onlinepubs/000095399/basedefs/sys/types.h.html
4. http://fxr.watson.org/fxr/source/nptl/sysdeps/pthread/pthread.h?v=GLIBC27#L209
PS I found a workaround for this issue at compile-time and run-time in
the test, but I found this to be an odd delta.
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