diff options
Diffstat (limited to 'lib/libc/gen/sem_init.3')
| -rw-r--r-- | lib/libc/gen/sem_init.3 | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/lib/libc/gen/sem_init.3 b/lib/libc/gen/sem_init.3 index 5938f2c..e00cd4b 100644 --- a/lib/libc/gen/sem_init.3 +++ b/lib/libc/gen/sem_init.3 @@ -46,9 +46,19 @@ function initializes the unnamed semaphore pointed to by .Fa sem to have the value .Fa value . +.Pp A non-zero value for .Fa pshared -specifies a shared semaphore that can be used by multiple processes. +specifies a shared semaphore that can be used by multiple processes, +the semaphore should be located in shared memory region (see +.Xr mmap 2 , +.Xr shm_open 2 , +and +.Xr shmget 2 ) , +any process having read and write access to address +.Fa sem +can perform semaphore operations on +.Fa sem . .Pp Following a successful call to .Fn sem_init , |
