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author | Rickard Green <rickard@erlang.org> | 2016-12-30 17:15:53 +0100 |
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committer | Rickard Green <rickard@erlang.org> | 2016-12-30 17:15:53 +0100 |
commit | 765e63dbffc4ec7f8cc3a7a1463151d6d863746f (patch) | |
tree | 8c63f05a28cf31915b182a2234d219f7d367742f | |
parent | 3473ecd83a7bbe7e0bebb865f25dddb93e3bf10f (diff) | |
download | otp-765e63dbffc4ec7f8cc3a7a1463151d6d863746f.tar.gz otp-765e63dbffc4ec7f8cc3a7a1463151d6d863746f.tar.bz2 otp-765e63dbffc4ec7f8cc3a7a1463151d6d863746f.zip |
Multi scheduling block bug-fixes
-rw-r--r-- | erts/emulator/beam/erl_process.c | 80 | ||||
-rw-r--r-- | erts/emulator/beam/erl_process.h | 2 |
2 files changed, 52 insertions, 30 deletions
diff --git a/erts/emulator/beam/erl_process.c b/erts/emulator/beam/erl_process.c index b345c35a7e..58097ad42f 100644 --- a/erts/emulator/beam/erl_process.c +++ b/erts/emulator/beam/erl_process.c @@ -7055,12 +7055,18 @@ typedef struct { } ErtsSchdlrSspndResume; static void -schdlr_sspnd_resume_proc(Eterm pid) +schdlr_sspnd_resume_proc(ErtsSchedType sched_type, Eterm pid) { - Process *p = erts_pid2proc(NULL, 0, pid, ERTS_PROC_LOCK_STATUS); + Process *p; + p = erts_pid2proc_opt(NULL, 0, pid, ERTS_PROC_LOCK_STATUS, + (sched_type != ERTS_SCHED_NORMAL + ? ERTS_P2P_FLG_INC_REFC + : 0)); if (p) { resume_process(p, ERTS_PROC_LOCK_STATUS); erts_smp_proc_unlock(p, ERTS_PROC_LOCK_STATUS); + if (sched_type != ERTS_SCHED_NORMAL) + erts_proc_dec_refc(p); } } @@ -7069,17 +7075,20 @@ schdlr_sspnd_resume_procs(ErtsSchedType sched_type, ErtsSchdlrSspndResume *resume) { if (is_internal_pid(resume->onln.chngr)) { - schdlr_sspnd_resume_proc(resume->onln.chngr); + schdlr_sspnd_resume_proc(sched_type, + resume->onln.chngr); resume->onln.chngr = NIL; } if (is_internal_pid(resume->onln.nxt)) { - schdlr_sspnd_resume_proc(resume->onln.nxt); + schdlr_sspnd_resume_proc(sched_type, + resume->onln.nxt); resume->onln.nxt = NIL; } while (resume->msb.chngrs) { ErtsProcList *plp = resume->msb.chngrs; resume->msb.chngrs = plp->next; - schdlr_sspnd_resume_proc(plp->pid); + schdlr_sspnd_resume_proc(sched_type, + plp->pid); proclist_destroy(plp); } } @@ -7198,15 +7207,18 @@ suspend_scheduler(ErtsSchedulerData *esdp) (void) erts_proclist_fetch(&msb[i]->chngq, &end_plp); /* resume processes that initiated the multi scheduling block... */ plp = msb[i]->chngq; - while (plp) { - erts_proclist_store_last(&msb[i]->blckrs, - proclist_copy(plp)); - plp = plp->next; - } - if (end_plp) + if (plp) { + ASSERT(end_plp); + ASSERT(msb[i]->ongoing); + do { + erts_proclist_store_last(&msb[i]->blckrs, + proclist_copy(plp)); + plp = plp->next; + } while (plp); end_plp->next = resume.msb.chngrs; - resume.msb.chngrs = msb[i]->chngq; - msb[i]->chngq = NULL; + resume.msb.chngrs = msb[i]->chngq; + msb[i]->chngq = NULL; + } } } } @@ -7415,12 +7427,23 @@ suspend_scheduler(ErtsSchedulerData *esdp) schdlr_sspnd_inc_nscheds(&schdlr_sspnd.active, sched_type); changing = erts_smp_atomic32_read_nob(&schdlr_sspnd.changing); - if ((changing & ERTS_SCHDLR_SSPND_CHNG_MSB) - && schdlr_sspnd.online == schdlr_sspnd.active) { - erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing, - ~ERTS_SCHDLR_SSPND_CHNG_MSB); - } - + if (changing) { + if ((changing & ERTS_SCHDLR_SSPND_CHNG_MSB) + && !schdlr_sspnd.msb.ongoing + && schdlr_sspnd.online == schdlr_sspnd.active) { + erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing, + ~ERTS_SCHDLR_SSPND_CHNG_MSB); + } + if ((changing & ERTS_SCHDLR_SSPND_CHNG_NMSB) + && !schdlr_sspnd.nmsb.ongoing + && (schdlr_sspnd_get_nscheds(&schdlr_sspnd.online, + ERTS_SCHED_NORMAL) + == schdlr_sspnd_get_nscheds(&schdlr_sspnd.active, + ERTS_SCHED_NORMAL))) { + erts_smp_atomic32_read_band_nob(&schdlr_sspnd.changing, + ~ERTS_SCHDLR_SSPND_CHNG_NMSB); + } + } ASSERT(no <= schdlr_sspnd_get_nscheds(&schdlr_sspnd.online, sched_type)); ASSERT((sched_type == ERTS_SCHED_NORMAL ? !(schdlr_sspnd.msb.ongoing|schdlr_sspnd.nmsb.ongoing) @@ -7553,7 +7576,7 @@ abort_sched_onln_chng_waitq(Process *p) erts_smp_mtx_unlock(&schdlr_sspnd.mtx); if (is_internal_pid(resume)) - schdlr_sspnd_resume_proc(resume); + schdlr_sspnd_resume_proc(ERTS_SCHED_NORMAL, resume); } ErtsSchedSuspendResult @@ -7951,21 +7974,20 @@ erts_block_multi_scheduling(Process *p, ErtsProcLocks plocks, int on, int normal } else { /* ------ UNBLOCK ------ */ if (p->flags & have_blckd_flg) { - ErtsProcList *plps[2]; + ErtsProcList **plpps[3] = {0}; ErtsProcList *plp; - int limit = 0; - plps[limit++] = erts_proclist_peek_first(msbp->blckrs); - if (all) - plps[limit++] = erts_proclist_peek_first(msbp->chngq); + plpps[0] = &msbp->blckrs; + if (all) + plpps[1] = &msbp->chngq; - for (ix = 0; ix < limit; ix++) { - plp = plps[ix]; + for (ix = 0; plpps[ix]; ix++) { + plp = erts_proclist_peek_first(*plpps[ix]); while (plp) { ErtsProcList *tmp_plp = plp; - plp = erts_proclist_peek_next(msbp->blckrs, plp); + plp = erts_proclist_peek_next(*plpps[ix], plp); if (erts_proclist_same(tmp_plp, p)) { - erts_proclist_remove(&msbp->blckrs, tmp_plp); + erts_proclist_remove(plpps[ix], tmp_plp); proclist_destroy(tmp_plp); if (!all) break; diff --git a/erts/emulator/beam/erl_process.h b/erts/emulator/beam/erl_process.h index 9f7084c127..68fbb10602 100644 --- a/erts/emulator/beam/erl_process.h +++ b/erts/emulator/beam/erl_process.h @@ -1684,7 +1684,7 @@ ERTS_GLB_INLINE ErtsProcList *erts_proclist_fetch_first(ErtsProcList **list) return NULL; else { ErtsProcList *res = *list; - if (res == *list) + if (res->next == *list) *list = NULL; else *list = res->next; |