diff options
Diffstat (limited to 'examples/System_V_IPC/SV_Semaphores/Semaphores_1.cpp')
-rw-r--r-- | examples/System_V_IPC/SV_Semaphores/Semaphores_1.cpp | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/examples/System_V_IPC/SV_Semaphores/Semaphores_1.cpp b/examples/System_V_IPC/SV_Semaphores/Semaphores_1.cpp new file mode 100644 index 00000000000..8af66b90f34 --- /dev/null +++ b/examples/System_V_IPC/SV_Semaphores/Semaphores_1.cpp @@ -0,0 +1,89 @@ +// $Id$ + +#include "ace/SV_Shared_Memory.h" +#include "ace/SV_Semaphore_Simple.h" +#include "ace/Malloc.h" + +#if defined (ACE_HAS_SYSV_IPC) + +// Shared memory allocator (note that this chews up the +// ACE_DEFAULT_SEM_KEY). +static ACE_Malloc<ACE_SHARED_MEMORY_POOL, ACE_SV_Semaphore_Simple> allocator; + +const int SEM_KEY = ACE_DEFAULT_SEM_KEY + 1; +const int SHMSZ = 27; + +static int +parent (char *shm) +{ + char *s = shm; + + ACE_SV_Semaphore_Complex sem (SEM_KEY, ACE_SV_Semaphore_Complex::ACE_CREATE, 0, 2); + + for (char c = 'a'; c <= 'z'; c++) + *s++ = c; + + *s = '\0'; + + if (sem.release (0) == -1) + ACE_ERROR ((LM_ERROR, "%p", "parent sem.release(0)")); + else if (sem.acquire (1) == -1) + ACE_ERROR ((LM_ERROR, "%p", "parent sem.acquire(1)")); + + if (allocator.remove () == -1) + ACE_ERROR ((LM_ERROR, "%p\n", "allocator.remove")); + if (sem.remove () == -1) + ACE_ERROR ((LM_ERROR, "%p\n", "sem.remove")); + return 0; +} + +static int +child (char *shm) +{ + ACE_SV_Semaphore_Complex sem (SEM_KEY, ACE_SV_Semaphore_Complex::ACE_CREATE, 0, 2); + + while (sem.tryacquire (0) == -1) + if (errno == EAGAIN) + ACE_DEBUG ((LM_DEBUG, "spinning in client!\n")); + else + ACE_ERROR_RETURN ((LM_ERROR, "client mutex.tryacquire(0)"), 1); + + for (char *s = (char *) shm; *s != '\0'; s++) + ACE_DEBUG ((LM_DEBUG, "%c", *s)); + + ACE_DEBUG ((LM_DEBUG, "\n")); + + if (sem.release (1) < 0) + ACE_ERROR ((LM_ERROR, "client sem.release(1)")); + return 0; +} + +int +main (void) +{ + char *shm = (char *) allocator.malloc (27); + + switch (ACE_OS::fork ()) + { + case -1: + ACE_ERROR_RETURN ((LM_ERROR, "fork failed\n"), -1); + /* NOTREACHED */ + case 0: + // Child. + return child (shm); + default: + return parent (shm); + } +} +#else +int main (void) +{ + ACE_ERROR ((LM_ERROR, + "SYSV IPC is not supported on this platform\n")); + return 0; +} +#endif /* ACE_HAS_SYSV_IPC */ + +#if defined (ACE_TEMPLATES_REQUIRE_SPECIALIZATION) +template class ACE_Malloc<ACE_SHARED_MEMORY_POOL, ACE_SV_Semaphore_Simple>; +#endif /* ACE_TEMPLATES_REQUIRE_SPECIALIZATION */ |