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-rw-r--r--erts/lib_src/pthread/ethr_event.c219
-rw-r--r--erts/lib_src/pthread/ethread.c477
2 files changed, 696 insertions, 0 deletions
diff --git a/erts/lib_src/pthread/ethr_event.c b/erts/lib_src/pthread/ethr_event.c
new file mode 100644
index 0000000000..6731c0eb46
--- /dev/null
+++ b/erts/lib_src/pthread/ethr_event.c
@@ -0,0 +1,219 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2009-2010. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+/*
+ * Author: Rickard Green
+ */
+
+#define ETHR_INLINE_FUNC_NAME_(X) X ## __
+#define ETHR_EVENT_IMPL__
+
+#include "ethread.h"
+
+#if defined(ETHR_LINUX_FUTEX_IMPL__)
+/* --- Linux futex implementation of ethread events ------------------------- */
+
+#include <sched.h>
+#include <errno.h>
+
+#define ETHR_YIELD_AFTER_BUSY_LOOPS 50
+
+int
+ethr_event_init(ethr_event *e)
+{
+ ethr_atomic_init(&e->futex, ETHR_EVENT_OFF__);
+ return 0;
+}
+
+int
+ethr_event_destroy(ethr_event *e)
+{
+ return 0;
+}
+
+static ETHR_INLINE int
+wait__(ethr_event *e, int spincount)
+{
+ unsigned sc = spincount;
+ int res;
+ long val;
+ int until_yield = ETHR_YIELD_AFTER_BUSY_LOOPS;
+
+ if (spincount < 0)
+ ETHR_FATAL_ERROR__(EINVAL);
+
+ while (1) {
+ while (1) {
+ val = ethr_atomic_read(&e->futex);
+ if (val == ETHR_EVENT_ON__)
+ return 0;
+ if (sc == 0)
+ break;
+ sc--;
+ ETHR_SPIN_BODY;
+ if (--until_yield == 0) {
+ until_yield = ETHR_YIELD_AFTER_BUSY_LOOPS;
+ res = ETHR_YIELD();
+ if (res != 0)
+ ETHR_FATAL_ERROR__(res);
+ }
+ }
+
+ if (val != ETHR_EVENT_OFF_WAITER__) {
+ val = ethr_atomic_cmpxchg(&e->futex,
+ ETHR_EVENT_OFF_WAITER__,
+ ETHR_EVENT_OFF__);
+
+ if (val == ETHR_EVENT_ON__)
+ return 0;
+ ETHR_ASSERT(val == ETHR_EVENT_OFF__);
+ }
+
+ res = ETHR_FUTEX__(&e->futex, ETHR_FUTEX_WAIT__, ETHR_EVENT_OFF_WAITER__);
+ if (res == EINTR)
+ break;
+ if (res != 0 && res != EWOULDBLOCK)
+ ETHR_FATAL_ERROR__(res);
+ }
+
+ return res;
+}
+
+#elif defined(ETHR_PTHREADS)
+/* --- Posix mutex/cond implementation of events ---------------------------- */
+
+int
+ethr_event_init(ethr_event *e)
+{
+ int res;
+ ethr_atomic_init(&e->state, ETHR_EVENT_OFF__);
+ res = pthread_mutex_init(&e->mtx, NULL);
+ if (res != 0)
+ return res;
+ res = pthread_cond_init(&e->cnd, NULL);
+ if (res != 0) {
+ pthread_mutex_destroy(&e->mtx);
+ return res;
+ }
+ return 0;
+}
+
+int
+ethr_event_destroy(ethr_event *e)
+{
+ int res;
+ res = pthread_mutex_destroy(&e->mtx);
+ if (res != 0)
+ return res;
+ res = pthread_cond_destroy(&e->cnd);
+ if (res != 0)
+ return res;
+ return 0;
+}
+
+static ETHR_INLINE int
+wait__(ethr_event *e, int spincount)
+{
+ int sc = spincount;
+ long val;
+ int res, ulres;
+ int until_yield = ETHR_YIELD_AFTER_BUSY_LOOPS;
+
+ if (spincount < 0)
+ ETHR_FATAL_ERROR__(EINVAL);
+
+ while (1) {
+ val = ethr_atomic_read(&e->state);
+ if (val == ETHR_EVENT_ON__)
+ return 0;
+ if (sc == 0)
+ break;
+ sc--;
+ ETHR_SPIN_BODY;
+ if (--until_yield == 0) {
+ until_yield = ETHR_YIELD_AFTER_BUSY_LOOPS;
+ res = ETHR_YIELD();
+ if (res != 0)
+ ETHR_FATAL_ERROR__(res);
+ }
+ }
+
+ if (val != ETHR_EVENT_OFF_WAITER__) {
+ val = ethr_atomic_cmpxchg(&e->state,
+ ETHR_EVENT_OFF_WAITER__,
+ ETHR_EVENT_OFF__);
+ if (val == ETHR_EVENT_ON__)
+ return 0;
+ ETHR_ASSERT(val == ETHR_EVENT_OFF__);
+ }
+
+ ETHR_ASSERT(val == ETHR_EVENT_OFF_WAITER__
+ || val == ETHR_EVENT_OFF__);
+
+ res = pthread_mutex_lock(&e->mtx);
+ if (res != 0)
+ ETHR_FATAL_ERROR__(res);
+
+ while (1) {
+
+ val = ethr_atomic_read(&e->state);
+ if (val == ETHR_EVENT_ON__)
+ break;
+
+ res = pthread_cond_wait(&e->cnd, &e->mtx);
+ if (res == EINTR)
+ break;
+ if (res != 0)
+ ETHR_FATAL_ERROR__(res);
+ }
+
+ ulres = pthread_mutex_unlock(&e->mtx);
+ if (ulres != 0)
+ ETHR_FATAL_ERROR__(ulres);
+
+ return res; /* 0 || EINTR */
+}
+
+#else
+#error No ethread event implementation
+#endif
+
+void
+ethr_event_reset(ethr_event *e)
+{
+ ethr_event_reset__(e);
+}
+
+void
+ethr_event_set(ethr_event *e)
+{
+ ethr_event_set__(e);
+}
+
+int
+ethr_event_wait(ethr_event *e)
+{
+ return wait__(e, 0);
+}
+
+int
+ethr_event_swait(ethr_event *e, int spincount)
+{
+ return wait__(e, spincount);
+}
diff --git a/erts/lib_src/pthread/ethread.c b/erts/lib_src/pthread/ethread.c
new file mode 100644
index 0000000000..ea1d9d43f0
--- /dev/null
+++ b/erts/lib_src/pthread/ethread.c
@@ -0,0 +1,477 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 2010. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+/*
+ * Description: Pthread implementation of the ethread library
+ * Author: Rickard Green
+ */
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#define ETHR_CHILD_WAIT_SPIN_COUNT 4000
+
+#include <stdio.h>
+#ifdef ETHR_TIME_WITH_SYS_TIME
+# include <time.h>
+# include <sys/time.h>
+#else
+# ifdef ETHR_HAVE_SYS_TIME_H
+# include <sys/time.h>
+# else
+# include <time.h>
+# endif
+#endif
+#include <sys/types.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include <limits.h>
+
+#define ETHR_INLINE_FUNC_NAME_(X) X ## __
+#define ETHREAD_IMPL__
+
+#include "ethread.h"
+#include "ethr_internal.h"
+
+#ifndef ETHR_HAVE_ETHREAD_DEFINES
+#error Missing configure defines
+#endif
+
+pthread_key_t ethr_ts_event_key__;
+static int child_wait_spin_count;
+
+/*
+ * --------------------------------------------------------------------------
+ * Static functions
+ * --------------------------------------------------------------------------
+ */
+
+static void thr_exit_cleanup(void)
+{
+ ethr_run_exit_handlers__();
+}
+
+
+/* Argument passed to thr_wrapper() */
+typedef struct {
+ ethr_atomic_t result;
+ ethr_ts_event *tse;
+ void *(*thr_func)(void *);
+ void *arg;
+ void *prep_func_res;
+} ethr_thr_wrap_data__;
+
+static void *thr_wrapper(void *vtwd)
+{
+ long result;
+ void *res;
+ ethr_thr_wrap_data__ *twd = (ethr_thr_wrap_data__ *) vtwd;
+ void *(*thr_func)(void *) = twd->thr_func;
+ void *arg = twd->arg;
+ ethr_ts_event *tsep = NULL;
+
+ result = (long) ethr_make_ts_event__(&tsep);
+
+ if (result == 0) {
+ tsep->iflgs |= ETHR_TS_EV_ETHREAD;
+ if (ethr_thr_child_func__)
+ ethr_thr_child_func__(twd->prep_func_res);
+ }
+
+ tsep = twd->tse; /* We aren't allowed to follow twd after
+ result has been set! */
+
+ ethr_atomic_set(&twd->result, result);
+
+ ethr_event_set(&tsep->event);
+
+ res = result == 0 ? (*thr_func)(arg) : NULL;
+
+ thr_exit_cleanup();
+ return res;
+}
+
+/* internal exports */
+
+int ethr_set_tse__(ethr_ts_event *tsep)
+{
+ return pthread_setspecific(ethr_ts_event_key__, (void *) tsep);
+}
+
+ethr_ts_event *ethr_get_tse__(void)
+{
+ return pthread_getspecific(ethr_ts_event_key__);
+}
+
+/*
+ * --------------------------------------------------------------------------
+ * Exported functions
+ * --------------------------------------------------------------------------
+ */
+
+int
+ethr_init(ethr_init_data *id)
+{
+ int res;
+
+ if (!ethr_not_inited__)
+ return EINVAL;
+
+ ethr_not_inited__ = 0;
+
+ res = ethr_init_common__(id);
+ if (res != 0)
+ goto error;
+
+ child_wait_spin_count = ETHR_CHILD_WAIT_SPIN_COUNT;
+ if (erts_get_cpu_configured(ethr_cpu_info__) == 1)
+ child_wait_spin_count = 0;
+
+ res = pthread_key_create(&ethr_ts_event_key__, ethr_ts_event_destructor__);
+
+ return 0;
+ error:
+ ethr_not_inited__ = 1;
+ return res;
+
+}
+
+int
+ethr_late_init(ethr_late_init_data *id)
+{
+ int res = ethr_late_init_common__(id);
+ if (res != 0)
+ return res;
+ ethr_not_completely_inited__ = 0;
+ return res;
+}
+
+int
+ethr_thr_create(ethr_tid *tid, void * (*func)(void *), void *arg,
+ ethr_thr_opts *opts)
+{
+ ethr_thr_wrap_data__ twd;
+ pthread_attr_t attr;
+ int res, dres;
+ int use_stack_size = (opts && opts->suggested_stack_size >= 0
+ ? opts->suggested_stack_size
+ : -1 /* Use system default */);
+
+#ifdef ETHR_MODIFIED_DEFAULT_STACK_SIZE
+ if (use_stack_size < 0)
+ use_stack_size = ETHR_MODIFIED_DEFAULT_STACK_SIZE;
+#endif
+
+#if ETHR_XCHK
+ if (ethr_not_completely_inited__) {
+ ETHR_ASSERT(0);
+ return EACCES;
+ }
+ if (!tid || !func) {
+ ETHR_ASSERT(0);
+ return EINVAL;
+ }
+#endif
+
+ ethr_atomic_init(&twd.result, -1);
+ twd.tse = ethr_get_ts_event();
+ twd.thr_func = func;
+ twd.arg = arg;
+
+ res = pthread_attr_init(&attr);
+ if (res != 0)
+ return res;
+
+ /* Error cleanup needed after this point */
+
+ /* Schedule child thread in system scope (if possible) ... */
+ res = pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
+ if (res != 0 && res != ENOTSUP)
+ goto error;
+
+ if (use_stack_size >= 0) {
+ size_t suggested_stack_size = (size_t) use_stack_size;
+ size_t stack_size;
+#ifdef ETHR_DEBUG
+ suggested_stack_size /= 2; /* Make sure we got margin */
+#endif
+#ifdef ETHR_STACK_GUARD_SIZE
+ /* The guard is at least on some platforms included in the stack size
+ passed when creating threads */
+ suggested_stack_size += ETHR_B2KW(ETHR_STACK_GUARD_SIZE);
+#endif
+ if (suggested_stack_size < ethr_min_stack_size__)
+ stack_size = ETHR_KW2B(ethr_min_stack_size__);
+ else if (suggested_stack_size > ethr_max_stack_size__)
+ stack_size = ETHR_KW2B(ethr_max_stack_size__);
+ else
+ stack_size = ETHR_PAGE_ALIGN(ETHR_KW2B(suggested_stack_size));
+ (void) pthread_attr_setstacksize(&attr, stack_size);
+ }
+
+#ifdef ETHR_STACK_GUARD_SIZE
+ (void) pthread_attr_setguardsize(&attr, ETHR_STACK_GUARD_SIZE);
+#endif
+
+ /* Detached or joinable... */
+ res = pthread_attr_setdetachstate(&attr,
+ (opts && opts->detached
+ ? PTHREAD_CREATE_DETACHED
+ : PTHREAD_CREATE_JOINABLE));
+ if (res != 0)
+ goto error;
+
+ /* Call prepare func if it exist */
+ if (ethr_thr_prepare_func__)
+ twd.prep_func_res = ethr_thr_prepare_func__();
+ else
+ twd.prep_func_res = NULL;
+
+ res = pthread_create((pthread_t *) tid, &attr, thr_wrapper, (void*) &twd);
+
+ if (res == 0) {
+ int spin_count = child_wait_spin_count;
+
+ /* Wait for child to initialize... */
+ while (1) {
+ long result;
+ ethr_event_reset(&twd.tse->event);
+
+ result = ethr_atomic_read(&twd.result);
+ if (result == 0)
+ break;
+
+ if (result > 0) {
+ res = (int) result;
+ goto error;
+ }
+
+ res = ethr_event_swait(&twd.tse->event, spin_count);
+ if (res != 0 && res != EINTR)
+ goto error;
+ spin_count = 0;
+ }
+ }
+
+ /* Cleanup... */
+
+ error:
+ dres = pthread_attr_destroy(&attr);
+ if (res == 0)
+ res = dres;
+ if (ethr_thr_parent_func__)
+ ethr_thr_parent_func__(twd.prep_func_res);
+ return res;
+}
+
+int
+ethr_thr_join(ethr_tid tid, void **res)
+{
+#if ETHR_XCHK
+ if (ethr_not_inited__) {
+ ETHR_ASSERT(0);
+ return EACCES;
+ }
+#endif
+ return pthread_join((pthread_t) tid, res);
+}
+
+int
+ethr_thr_detach(ethr_tid tid)
+{
+#if ETHR_XCHK
+ if (ethr_not_inited__) {
+ ETHR_ASSERT(0);
+ return EACCES;
+ }
+#endif
+ return pthread_detach((pthread_t) tid);
+}
+
+void
+ethr_thr_exit(void *res)
+{
+#if ETHR_XCHK
+ if (ethr_not_inited__) {
+ ETHR_ASSERT(0);
+ return;
+ }
+#endif
+ thr_exit_cleanup();
+ pthread_exit(res);
+}
+
+ethr_tid
+ethr_self(void)
+{
+ return (ethr_tid) pthread_self();
+}
+
+int
+ethr_equal_tids(ethr_tid tid1, ethr_tid tid2)
+{
+ return pthread_equal((pthread_t) tid1, (pthread_t) tid2);
+}
+
+
+/*
+ * Thread specific events
+ */
+
+ethr_ts_event *
+ethr_get_ts_event(void)
+{
+ return ethr_get_ts_event__();
+}
+
+void
+ethr_leave_ts_event(ethr_ts_event *tsep)
+{
+ ethr_leave_ts_event__(tsep);
+}
+
+/*
+ * Current time
+ */
+
+int
+ethr_time_now(ethr_timeval *time)
+{
+ int res;
+ struct timeval tv;
+#if ETHR_XCHK
+ if (ethr_not_inited__) {
+ ETHR_ASSERT(0);
+ return EACCES;
+ }
+ if (!time) {
+ ETHR_ASSERT(0);
+ return EINVAL;
+ }
+#endif
+
+ res = gettimeofday(&tv, NULL);
+ time->tv_sec = (long) tv.tv_sec;
+ time->tv_nsec = ((long) tv.tv_usec)*1000;
+ return res;
+}
+
+/*
+ * Thread specific data
+ */
+
+int
+ethr_tsd_key_create(ethr_tsd_key *keyp)
+{
+#if ETHR_XCHK
+ if (ethr_not_inited__) {
+ ETHR_ASSERT(0);
+ return EACCES;
+ }
+ if (!keyp) {
+ ETHR_ASSERT(0);
+ return EINVAL;
+ }
+#endif
+ return pthread_key_create((pthread_key_t *) keyp, NULL);
+}
+
+int
+ethr_tsd_key_delete(ethr_tsd_key key)
+{
+#if ETHR_XCHK
+ if (ethr_not_inited__) {
+ ETHR_ASSERT(0);
+ return EACCES;
+ }
+#endif
+ return pthread_key_delete((pthread_key_t) key);
+}
+
+int
+ethr_tsd_set(ethr_tsd_key key, void *value)
+{
+#if ETHR_XCHK
+ if (ethr_not_inited__) {
+ ETHR_ASSERT(0);
+ return EACCES;
+ }
+#endif
+ return pthread_setspecific((pthread_key_t) key, value);
+}
+
+void *
+ethr_tsd_get(ethr_tsd_key key)
+{
+#if ETHR_XCHK
+ if (ethr_not_inited__) {
+ ETHR_ASSERT(0);
+ return NULL;
+ }
+#endif
+ return pthread_getspecific((pthread_key_t) key);
+}
+
+/*
+ * Signal functions
+ */
+
+#if ETHR_HAVE_ETHR_SIG_FUNCS
+
+int ethr_sigmask(int how, const sigset_t *set, sigset_t *oset)
+{
+#if ETHR_XCHK
+ if (ethr_not_inited__) {
+ ETHR_ASSERT(0);
+ return EACCES;
+ }
+ if (!set && !oset) {
+ ETHR_ASSERT(0);
+ return EINVAL;
+ }
+#endif
+ return pthread_sigmask(how, set, oset);
+}
+
+int ethr_sigwait(const sigset_t *set, int *sig)
+{
+#if ETHR_XCHK
+ if (ethr_not_inited__) {
+ ETHR_ASSERT(0);
+ return EACCES;
+ }
+ if (!set || !sig) {
+ ETHR_ASSERT(0);
+ return EINVAL;
+ }
+#endif
+ if (sigwait(set, sig) < 0)
+ return errno;
+ return 0;
+}
+
+#endif /* #if ETHR_HAVE_ETHR_SIG_FUNCS */
+
+ETHR_IMPL_NORETURN__
+ethr_abort__(void)
+{
+ abort();
+}
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