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| author | Joel Sherrill <joel.sherrill@OARcorp.com> | 2006-03-07 20:47:53 +0000 |
|---|---|---|
| committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 2006-03-07 20:47:53 +0000 |
| commit | f0ad529d28688214568532c0d30eb13654db1462 (patch) | |
| tree | 0b254b2a26f754f598edf2b441c2ebd7576666ea /cpukit/score/include/rtems/system.h | |
| parent | New. (diff) | |
| download | rtems-f0ad529d28688214568532c0d30eb13654db1462.tar.bz2 | |
2006-03-07 Joel Sherrill <joel@OARcorp.com>
PR 866/rtems
* score/include/rtems/system.h, score/include/rtems/score/isr.h,
score/inline/rtems/score/thread.inl,
score/macros/rtems/score/thread.inl: Added memory barriers to enter
and exit of dispatching and interrupt critical sections so GCC will
not optimize and reorder code out of a critical section.
Diffstat (limited to 'cpukit/score/include/rtems/system.h')
| -rw-r--r-- | cpukit/score/include/rtems/system.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/cpukit/score/include/rtems/system.h b/cpukit/score/include/rtems/system.h index 59d5b293af..9558155daf 100644 --- a/cpukit/score/include/rtems/system.h +++ b/cpukit/score/include/rtems/system.h @@ -135,6 +135,17 @@ extern "C" { # define RTEMS_INLINE_ROUTINE #endif +/** + * The following macro is a compiler specific way to ensure that memory + * writes are not reordered around certian points. This specifically can + * impact interrupt disable and thread dispatching critical sections. + */ +#ifdef __GNUC__ + #define RTEMS_COMPILER_MEMORY_BARRIER() asm volatile("" ::: "memory") +#else + #define RTEMS_COMPILER_MEMORY_BARRIER() +#endif + #ifdef RTEMS_POSIX_API /** The following is used by the POSIX implementation to catch bad paths. */ int POSIX_MP_NOT_IMPLEMENTED( void ); |