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Replace atomic_increment and atomic_increment_val with atomic_fetch_add_relaxed.
One case in sem_post.c uses release semantics (see comment above it).
The others are simple counters and do not protect any shared data from
concurrent accesses.
Passes regress on AArch64.
Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
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Replace atomic_decrement and atomic_decrement_val with
atomic_fetch_add_relaxed.
Reviewed-by: DJ Delorie <dj@redhat.com>
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The function sem_close is AC-unsafe because lll_lock*
leaks a lock (aculock) and not because of twalk.
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This patch adds a new "Inter-Process Communication"
chapter to cover the sem*, msg*, and shm* functions.
Initially we document only the sem* function signatures
and their safety notes.
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