This is the mail archive of the crossgcc@sourceware.org mailing list for the crossgcc project.
See the CrossGCC FAQ for lots more information.
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |
Other format: | [Raw text] |
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. -- For unsubscribe information see http://sourceware.org/lists.html#faq
Index Nav: | [Date Index] [Subject Index] [Author Index] [Thread Index] | |
---|---|---|
Message Nav: | [Date Prev] [Date Next] | [Thread Prev] [Thread Next] |