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use GCD semaphores on macOS #11

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29 changes: 27 additions & 2 deletions smtpping.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,11 @@ using std::vector;
#include <errno.h>
#include <semaphore.h>
#include <sys/mman.h>
#if _POSIX_SEMAPHORES && MAP_ANONYMOUS
#ifdef __APPLE__
// use supported GCD semaphores instead of unsupported POSIX semaphores
#include <dispatch/dispatch.h>
#endif
#if (_POSIX_SEMAPHORES && MAP_ANONYMOUS) || __APPLE__
#define SUPPORT_RATE
#endif
#endif
Expand Down Expand Up @@ -438,9 +442,14 @@ int main(int argc, char* argv[])
}

#ifdef SUPPORT_RATE
#ifdef __APPLE__
dispatch_semaphore_t sem;
sem = dispatch_semaphore_create(1);
#else
sem_t* sem = (sem_t*)mmap(NULL, sizeof(sem_t), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
if (sem_init(sem, 1, 1) != 0)
fprintf(stderr, "sem_init: failed\n");
perror("sem_init");
#endif
size_t* counter = (size_t*)mmap(NULL, sizeof(size_t), PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANONYMOUS, -1, 0);
*counter = 0;
#else
Expand All @@ -464,10 +473,18 @@ int main(int argc, char* argv[])
}
#ifdef SUPPORT_RATE
while (show_rate && !abort_ping) {
#ifdef __APPLE__
dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
#else
sem_wait(sem);
#endif
printf("%zu\n", *counter);
*counter = 0;
#ifdef __APPLE__
dispatch_semaphore_signal(sem);
#else
sem_post(sem);
#endif
sleep(1);
}
#endif
Expand Down Expand Up @@ -773,9 +790,17 @@ int main(int argc, char* argv[])

#ifdef SUPPORT_RATE
if (show_rate) {
#ifdef __APPLE__
dispatch_semaphore_wait(sem, DISPATCH_TIME_FOREVER);
#else
sem_wait(sem);
#endif
(*counter)++;
#ifdef __APPLE__
dispatch_semaphore_signal(sem);
#else
sem_post(sem);
#endif
}
#endif

Expand Down