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如果5个进程在semphore中等待会发生什么？

[英]What happens if 5 processes waiting in a semphore?

原文 2015-01-09 13:18:29 1 1 c/ semaphore

Im using semaphore.h, what is happening if 5 child processes waiting on sem_wait while another child process unlocking the semaphore sem_post ? 我使用semaphore.h，如果5个子进程在sem_wait上sem_wait而另一个子进程解锁信号量sem_post什么？ Are they all going to be unlocked? 它们都将被解锁吗？

1 个解决方案

No, only one will be unblocked. 不，只有一个会被解锁。 RTFM. RTFM。

sem_wait sem_wait

sem_post sem_post

If many processes are block, then one will be chosen to be unblocked, which one is up to OS. 如果许多进程被阻塞，那么将选择一个进程被解除阻塞，其中一个进程取决于操作系统。 Scheduler will choose one. 调度程序将选择一个。

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相关问题 等待用户输入的进程实际发生了什么？ - What actually happens to a process waiting for user input? 当pthread在等待互斥锁时死机会发生什么？ - What happens when a pthread dies while waiting on a mutex? 当很多进程打开同一个特殊文件时会发生什么？ - What happens when a lot of processes open the same special file? 在fork（）进程中没有针对父进程的操作时会发生什么？ - What happens when there are no actions for parent process during fork() processes? 如果我删除其他进程的共享内存会发生什么？ - What happens if I remove shared memory of other processes? 我在XV6中杀了进程“A”，对于“A”的子进程会发生什么 - I kill process “A” in XV6 , what happens to child processes of “A” 当两个进程试图访问信号量= 0的关键部分时会发生什么？ - What happens when two processes are trying to access a critical section with semaphore = 0? 当两个进程等待同一个孩子时会发生什么？ - What happens when two processes wait for the same child? 当两个进程写入mmaped文件的相同部分时会发生什么？ - What happens when two processes write to same portion of a mmaped file? 在等待来自多个进程的信号时sigwait出了什么问题 - What's wrong with sigwait while waiting signals from multiple processes

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