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【操作系统百科】futex

2026-05-31 | os | #futex #pthread-mutex #priority-inheritance #robust-futex #futex2

glibc pthread_mutex 背后是 futex——用户态快路径无 syscall，竞争时才进内核。本文讲 FUTEX_WAIT/WAKE、PI futex、robust futex、futex2、requeue、安全补丁与工程陷阱。