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| author | Rickard Green <rickard@erlang.org> | 2016-08-11 15:45:05 +0200 |
|---|---|---|
| committer | Rickard Green <rickard@erlang.org> | 2016-08-11 16:22:18 +0200 |
| commit | 17c838402c6d71aef041548ad36ee66db6f24a56 (patch) | |
| tree | 7d0074dc86913ddb0812157e0d8513d729cbc0ff | |
| parent | 74a95b3d511177a9b35c2b0272b9ca5511b6f750 (diff) | |
| download | erlang-17c838402c6d71aef041548ad36ee66db6f24a56.tar.gz | |
Fix race causing lost wakeup on receive-after timeout
| -rw-r--r-- | erts/emulator/beam/beam_emu.c | 5 | ||||
| -rw-r--r-- | erts/emulator/beam/erl_hl_timer.c | 5 |
2 files changed, 8 insertions, 2 deletions
diff --git a/erts/emulator/beam/beam_emu.c b/erts/emulator/beam/beam_emu.c index 8b409e139b..17df14acfe 100644 --- a/erts/emulator/beam/beam_emu.c +++ b/erts/emulator/beam/beam_emu.c @@ -2166,7 +2166,10 @@ void process_main(void) c_p->i = (BeamInstr *) Arg(0); /* L1 */ SWAPOUT; c_p->arity = 0; - erts_smp_atomic32_read_band_relb(&c_p->state, ~ERTS_PSFLG_ACTIVE); + + if (!ERTS_PTMR_IS_TIMED_OUT(c_p)) + erts_smp_atomic32_read_band_relb(&c_p->state, + ~ERTS_PSFLG_ACTIVE); ASSERT(!ERTS_PROC_IS_EXITING(c_p)); erts_smp_proc_unlock(c_p, ERTS_PROC_LOCKS_MSG_RECEIVE); c_p->current = NULL; diff --git a/erts/emulator/beam/erl_hl_timer.c b/erts/emulator/beam/erl_hl_timer.c index 51a0d68247..96bb5ac9fa 100644 --- a/erts/emulator/beam/erl_hl_timer.c +++ b/erts/emulator/beam/erl_hl_timer.c @@ -735,7 +735,10 @@ proc_timeout_common(Process *proc, void *tmr) if (tmr == (void *) erts_smp_atomic_cmpxchg_mb(&proc->common.timer, ERTS_PTMR_TIMEDOUT, (erts_aint_t) tmr)) { - erts_aint32_t state = erts_smp_atomic32_read_acqb(&proc->state); + erts_aint32_t state; + erts_smp_proc_lock(proc, ERTS_PROC_LOCKS_MSG_RECEIVE); + state = erts_smp_atomic32_read_acqb(&proc->state); + erts_smp_proc_unlock(proc, ERTS_PROC_LOCKS_MSG_RECEIVE); if (!(state & (ERTS_PSFLG_ACTIVE|ERTS_PSFLG_EXITING))) erts_schedule_process(proc, state, 0); return 1; |