Using mutexes / semaphores with processes

Question

Almost all codes and tutorials that I read on the Internet include using mutexes and semaphores to synchronize between threads. Can they be used to synchronize between processes?

I would like to write code that looks like this:

void compute_and_print() {
   // acquire mutex
   // critical section
   // release mutex
}

void main() {
int pid = fork();
if ( pid == 0 ) {
  // do something
  compute_and_print();
}
else {
  // do something
  compute_and_print();
}
}

• Can someone point me to similar code that does this?
• I understand that different processes have different address spaces, but I think that if the above were different address spaces, would the mutex refer to the same kernel object?

Answer 1

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Answer 2

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SysV, semget, semop, semctl ( ) ftok.

"posix" sem_open/sem_init, sem_wait, sem_post, sem_close sem_unlink.

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Answer 3

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Sys V IPC Linux

Answer 4

mutex/semaphore's. fooobar.com/questions/26206/..., . IBM, pthread_mutexattr_setname_np. , mutex Linux 100% (.. Ubuntu, CentOS .. ..), , . , . SysV IPC.

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