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author | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2017-06-27 10:49:51 -0300 |
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committer | Adhemerval Zanella <adhemerval.zanella@linaro.org> | 2018-07-24 14:07:01 -0300 |
commit | 3c20a679b6e31af07542e56a446e2433fba53a7e (patch) | |
tree | b75bced95246c531ddd88d0f9429fbea145948ac /nptl/threads.h | |
parent | 18d59c1b36e97d438ed964eb483c119517c18fee (diff) | |
download | glibc-3c20a679b6e31af07542e56a446e2433fba53a7e.tar.gz glibc-3c20a679b6e31af07542e56a446e2433fba53a7e.tar.xz glibc-3c20a679b6e31af07542e56a446e2433fba53a7e.zip |
nptl: Add C11 threads call_once functions
This patch adds the call_* definitions from C11 threads (ISO/IEC 9899:2011), more specifically call_once and required types. Mostly of the definitions are composed based on POSIX conterparts,including once_flag (pthread_once_t). The idea is to make possible to share POSIX internal implementations for mostly of the code (and making adjustment only when required). Checked with a build for all major ABI (aarch64-linux-gnu, alpha-linux-gnu, arm-linux-gnueabi, i386-linux-gnu, ia64-linux-gnu, m68k-linux-gnu, microblaze-linux-gnu [1], mips{64}-linux-gnu, nios2-linux-gnu, powerpc{64le}-linux-gnu, s390{x}-linux-gnu, sparc{64}-linux-gnu, and x86_64-linux-gnu). Also ran a full check on aarch64-linux-gnu, x86_64-linux-gnu, i686-linux-gnu, arm-linux-gnueabhf, and powerpc64le-linux-gnu. [BZ #14092] * conform/data/threads.h-data (ONCE_FLAG_INIT): New macro. (once_flag): New type. (call_once): New function. * nptl/Makefile (libpthread-routines): Add call_once object. * nptl/Versions (libphread) [GLIBC_2.28]: Add call_once symbol. * nptl/call_once.c: New file. * sysdeps/nptl/threads.h (ONCE_FLAG_INIT): New define. (once_flag): New type. (call_once): New prototype.
Diffstat (limited to 'nptl/threads.h')
-rw-r--r-- | nptl/threads.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/nptl/threads.h b/nptl/threads.h index 13d0075ea9..32f7cf8f75 100644 --- a/nptl/threads.h +++ b/nptl/threads.h @@ -48,6 +48,12 @@ enum mtx_timed = 2 }; +typedef struct +{ + int __data __ONCE_ALIGNMENT; +} once_flag; +#define ONCE_FLAG_INIT { 0 } + typedef union { char __size[__SIZEOF_PTHREAD_MUTEX_T]; @@ -129,6 +135,11 @@ extern int mtx_unlock (mtx_t *__mutex); /* Destroy the mutex object pointed by __MUTEX. */ extern void mtx_destroy (mtx_t *__mutex); + +/* Call function __FUNC exactly once, even if invoked from several threads. + All calls must be made with the same __FLAGS object. */ +extern void call_once (once_flag *__flag, void (*__func)(void)); + __END_DECLS #endif /* _THREADS_H */ |