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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2012-08-27 12:59:11 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2012-08-27 12:59:11 +0200 |
| commit | 352c778d019173a05162bbe1f2d134b0c2039803 (patch) | |
| tree | de12781fa0490ed60e468aa1b7637b85cc76853d /man2 | |
| parent | 77ba6370c2c5638a48df06578402558e7e6f0f27 (diff) | |
| download | man-pages-352c778d019173a05162bbe1f2d134b0c2039803.tar.gz | |
semop.2: Recast discussion of blocking behavior in terms of threads
semop() blocks the calling thread, not the process.
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
Diffstat (limited to 'man2')
| -rw-r--r-- | man2/semop.2 | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/man2/semop.2 b/man2/semop.2 index 60a6072aca..bdf2ddcb0a 100644 --- a/man2/semop.2 +++ b/man2/semop.2 @@ -123,10 +123,10 @@ the semaphore value .RI ( semval ). Furthermore, if .B SEM_UNDO -is specified for this operation, the system updates the process undo count +is specified for this operation, the system updates the undo count .RI ( semadj ) for this semaphore. -This operation can always proceed\(emit never forces a process to wait. +This operation can always proceed\(emit never forces a thread to wait. The calling process must have alter permission on the semaphore set. .PP If @@ -150,8 +150,8 @@ set to is performed). Otherwise .I semzcnt -(the count of processes waiting until this semaphore's value becomes zero) -is incremented by one and the process sleeps until +(the count of threads waiting until this semaphore's value becomes zero) +is incremented by one and the thread sleeps until one of the following occurs: .IP \(bu 3 .I semval @@ -167,7 +167,7 @@ fails, with set to .BR EIDRM . .IP \(bu -The calling process catches a signal: +The calling thread catches a signal: the value of .I semzcnt is decremented and @@ -203,7 +203,7 @@ is subtracted from .IR semval , and, if .B SEM_UNDO -is specified for this operation, the system updates the process undo count +is specified for this operation, the system updates the undo count .RI ( semadj ) for this semaphore. If the absolute value of @@ -224,8 +224,8 @@ set to is performed). Otherwise .I semncnt -(the counter of processes waiting for this semaphore's value to increase) -is incremented by one and the process sleeps until +(the counter of threads waiting for this semaphore's value to increase) +is incremented by one and the thread sleeps until one of the following occurs: .IP \(bu 3 .I semval @@ -239,7 +239,7 @@ is subtracted from .I semval and, if .B SEM_UNDO -is specified for this operation, the system updates the process undo count +is specified for this operation, the system updates the undo count .RI ( semadj ) for this semaphore. .IP \(bu @@ -250,7 +250,7 @@ fails, with set to .BR EIDRM . .IP \(bu -The calling process catches a signal: +The calling thread catches a signal: the value of .I semncnt is decremented and @@ -273,7 +273,7 @@ On successful completion, the .I sempid value for each semaphore specified in the array pointed to by .I sops -is set to the process ID of the calling process. +is set to the caller's process ID. In addition, the .I sem_otime .\" and @@ -283,7 +283,7 @@ is set to the current time. .BR semtimedop () behaves identically to .BR semop () -except that in those cases were the calling process would sleep, +except that in those cases were the calling thread would sleep, the duration of that sleep is limited by the amount of elapsed time specified by the .I timespec @@ -365,7 +365,7 @@ of semaphores in the set. The semaphore set was removed. .TP .B EINTR -While blocked in this system call, the process caught a signal; see +While blocked in this system call, the thread caught a signal; see .BR signal (7). .TP .B EINVAL @@ -494,7 +494,7 @@ as far as possible (i.e., to zero) and allowing process termination to proceed immediately. In kernels 2.6.x, x <= 10, there is a bug that in some circumstances -prevents a process that is waiting for a semaphore value to become +prevents a thread that is waiting for a semaphore value to become zero from being woken up when the value does actually become zero. This bug is fixed in kernel 2.6.11. .\" The bug report: |