Messages in this thread |  | | | Date | Mon, 16 May 2005 22:17:04 +0200 | | From | Patrick Plattes <> | | Subject | semaphore understanding: sys_semtimedop() |
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Hello,
i have a question about this little code snippet, found in sys_semtimedop() (ipc/sem.c):
for (sop = sops; sop < sops + nsops; sop++) { if (sop->sem_num >= max) max = sop->sem_num; if (sop->sem_flg & SEM_UNDO) undos++; if (sop->sem_op < 0) decrease = 1; if (sop->sem_op > 0) alter = 1; } alter |= decrease; The variable decrease will never be used again in this function, so why this intricate code? Isn't this much easier and works also:
for (sop = sops; sop < sops + nsops; sop++) { if (sop->sem_num >= max) max = sop->sem_num; if (sop->sem_flg & SEM_UNDO) undos++; if (sop->sem_op != 0) alter = 1; } Maybe i'm totally wrong, so please correct me and don't shoot me up, 'cause i'm not a os developer.
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