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I have the following test program. #include <iostream> #include <cstdlib> using namespace std; pthread_mutex_t mymutex = PTHREAD_MUTEX_INITIALIZER; int main(int argc, char *argv[]) { int iret; iret = pthread_mutex_trylock( & mymutex ); cout << "Test2 !!! " << endl; pthread_mutex_unlock( & mymutex ); return EXIT_SUCCESS; } If I compile it without adding the pthread library I get the error for unresolved error for pthread_mutex_trylock , but only for function pthread_mutex_trylock. If I replace pthread_mutex_trylock with pthread_mutex_trylock the program is compiled and runnig well also without the -lpthread* option. If I add the -lpthraed option to the compile commands all runs well this run well : $ g++ test2.c -o test2 -lpthread this warn unresolved : $ g++ test2.c -o test2 Example error output: $ g++ test2.c -o test2 /tmp/ccU1bBdU.o: In function main': test2.c:(.text+0x11): undefined reference to pthread_mutex_trylock' collect2: ld returned 1 exit status If I replace the instruction iret = pthread_mutex_trylock( & mymutex ); with iret = pthread_mutex_lock( & mymutex ); the program compiles and run without error also if didn't add the pthread libarry to the compile command I know that is right to have the unresolved error if I didn't use the -lpthread option , but why I have not the same unresolved error also for other pthread_ function ? I'm using gcc 4.4.2 on fedora 12 $ g++ --version g++ (GCC) 4.4.2 20091222 (Red Hat 4.4.2-20) Copyright (C) 2009 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. Do some have some suggestion about the meaning of this unre

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