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

[Khem Raj <raj.khem@gmail.com>]

On (04/01/12 13:34), Daniel Lehne wrote:
> 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?

add #define _GNU_SOURCE
at the top of your source file.

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