OSELAS.Toolchain-2011.03.0: PTHREAD_PRIO_INHERIT undeclared for arm-1136jfs-linux-gcc

[Daniel Lehne <daniel.lehne@amk-drives.bg>]

Hello,

in c++ the protocol PTHREAD_PRIO_INHERIT protocol for mutexes is 
available, but for c it is not available.
I've traced it up to features.h which declares __USE_UNIX98 for 
_XOPEN_SOURCE = 500. Once __USE_UNIX98 is set the protocols are 
available in pthread.h. How it is activated by c++, i don't know. It is 
confusing, because pthread_mutexattr_setprotocol() is declared but the 
protocols not.

simple example - reproduce on compile everytime:

/* test of problem PTHREAD_PRIO_INHERIT undeclared in pthread.h (only in 
gcc, cpp with g++ no problem) */
/* toolchain: 
OSELAS.Toolchain-2011.03.0/arm-1136jfs-linux-gnueabi/gcc-4.5.2-glibc-2.13-binutils-2.21-kernel-2.6.36-sanitized/bin/arm-1136jfs-linux-gnueabi-gcc 
*/
/* linked libs: pthread */

#include <pthread.h>

int main(int argc, char* argv[])
{
   int iRet;
   pthread_mutexattr_t csAttr;

   iRet = pthread_mutexattr_init(&csAttr);
   if (iRet == 0)
     iRet = pthread_mutexattr_settype(&csAttr, PTHREAD_MUTEX_ERRORCHECK);
   if (iRet == 0)
     iRet = pthread_mutexattr_setprotocol(&csAttr, 
PTHREAD_PRIO_INHERIT); // error: PTHREAD_PRIO_INHERIT undeclared

   pthread_mutexattr_destroy(&csAttr);
   return 0;
}

This example was build with the following configuration and output:
Building file: ../main.c
Invoking: GCC C Compiler
/opt/OSELAS.Toolchain-2011.03.0/arm-1136jfs-linux-gnueabi/gcc-4.5.2-glibc-2.13-binutils-2.21-kernel-2.6.36-sanitized/bin/arm-1136jfs-linux-gnueabi-gcc 
-O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"main.d" -MT"main.d" 
-o"main.o" "../main.c"
../main.c: In function 'main':
../main.c:14:51: error: 'PTHREAD_PRIO_INHERIT' undeclared (first use in 
this function)
../main.c:14:51: note: each undeclared identifier is reported only once 
for each function it appears in
make: *** [main.o] Error 1
make: Target `all' not remade because of errors.

Why this protocol is only for __USE_UNIX98 allowed? Is there a solution 
to use this protocol PTHREAD_PRIO_INHERIT  with gcc?

Best regards!

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