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include/boost/config/platform/vxworks.hpp  view on Meta::CPAN

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// different from what "normal" OSes do, regarding their scheduling!
// This could lead to a scenario called "priority inversion" when using
// semaphores, see http://en.wikipedia.org/wiki/Priority_inversion.
//
// Now, VxWorks POSIX-semaphores for DKM's default to the usage of
// priority inverting semaphores, which is fine. On the other hand,
// for RTP's it defaults to using non priority inverting semaphores,
// which could easily pose a serious problem for a real time process.
//
// To change the default properties for POSIX-semaphores in VxWorks 7
// enable core > CORE_USER Menu > DEFAULT_PTHREAD_PRIO_INHERIT 
//  
// In VxWorks 6.x so as to integrate with boost. 
// - Edit the file 
//   installDir/vxworks-6.x/target/usr/src/posix/pthreadLib.c
// - Around line 917 there should be the definition of the default
//   mutex attributes:
//
//   LOCAL pthread_mutexattr_t defaultMutexAttr =
//       {
//       PTHREAD_INITIALIZED_OBJ, PTHREAD_PRIO_NONE, 0,