#include <unistd.h>
#include "compiler.h"
#include "hash.h"
+#include "ovs-rcu.h"
#include "poll-loop.h"
#include "socket-util.h"
#include "util.h"
OVS_NO_THREAD_SAFETY_ANALYSIS \
{ \
struct ovs_##TYPE *l = CONST_CAST(struct ovs_##TYPE *, l_); \
- int error = pthread_##TYPE##_##FUN(&l->lock); \
+ int error; \
+ \
+ /* Verify that 'l' was initialized. */ \
+ ovs_assert(l->where); \
+ \
+ error = pthread_##TYPE##_##FUN(&l->lock); \
if (OVS_UNLIKELY(error)) { \
ovs_abort(error, "pthread_%s_%s failed", #TYPE, #FUN); \
} \
l->where = where; \
- }
+ }
LOCK_FUNCTION(mutex, lock);
LOCK_FUNCTION(rwlock, rdlock);
LOCK_FUNCTION(rwlock, wrlock);
OVS_NO_THREAD_SAFETY_ANALYSIS \
{ \
struct ovs_##TYPE *l = CONST_CAST(struct ovs_##TYPE *, l_); \
- int error = pthread_##TYPE##_##FUN(&l->lock); \
+ int error; \
+ \
+ /* Verify that 'l' was initialized. */ \
+ ovs_assert(l->where); \
+ \
+ error = pthread_##TYPE##_##FUN(&l->lock); \
if (OVS_UNLIKELY(error) && error != EBUSY) { \
ovs_abort(error, "pthread_%s_%s failed", #TYPE, #FUN); \
} \
TRY_LOCK_FUNCTION(rwlock, tryrdlock);
TRY_LOCK_FUNCTION(rwlock, trywrlock);
-#define UNLOCK_FUNCTION(TYPE, FUN) \
+#define UNLOCK_FUNCTION(TYPE, FUN, WHERE) \
void \
ovs_##TYPE##_##FUN(const struct ovs_##TYPE *l_) \
OVS_NO_THREAD_SAFETY_ANALYSIS \
{ \
struct ovs_##TYPE *l = CONST_CAST(struct ovs_##TYPE *, l_); \
int error; \
- l->where = NULL; \
+ \
+ /* Verify that 'l' was initialized. */ \
+ ovs_assert(l->where); \
+ \
+ l->where = WHERE; \
error = pthread_##TYPE##_##FUN(&l->lock); \
if (OVS_UNLIKELY(error)) { \
ovs_abort(error, "pthread_%s_%sfailed", #TYPE, #FUN); \
} \
}
-UNLOCK_FUNCTION(mutex, unlock);
-UNLOCK_FUNCTION(mutex, destroy);
-UNLOCK_FUNCTION(rwlock, unlock);
-UNLOCK_FUNCTION(rwlock, destroy);
+UNLOCK_FUNCTION(mutex, unlock, "<unlocked>");
+UNLOCK_FUNCTION(mutex, destroy, NULL);
+UNLOCK_FUNCTION(rwlock, unlock, "<unlocked>");
+UNLOCK_FUNCTION(rwlock, destroy, NULL);
#define XPTHREAD_FUNC1(FUNCTION, PARAM1) \
void \
ovs_abort(error, "%s failed", #FUNCTION); \
} \
}
+#define XPTHREAD_FUNC3(FUNCTION, PARAM1, PARAM2, PARAM3)\
+ void \
+ x##FUNCTION(PARAM1 arg1, PARAM2 arg2, PARAM3 arg3) \
+ { \
+ int error = FUNCTION(arg1, arg2, arg3); \
+ if (OVS_UNLIKELY(error)) { \
+ ovs_abort(error, "%s failed", #FUNCTION); \
+ } \
+ }
XPTHREAD_FUNC1(pthread_mutex_lock, pthread_mutex_t *);
XPTHREAD_FUNC1(pthread_mutex_unlock, pthread_mutex_t *);
XPTHREAD_FUNC2(pthread_mutexattr_settype, pthread_mutexattr_t *, int);
XPTHREAD_FUNC2(pthread_mutexattr_gettype, pthread_mutexattr_t *, int *);
+XPTHREAD_FUNC1(pthread_rwlockattr_init, pthread_rwlockattr_t *);
+XPTHREAD_FUNC1(pthread_rwlockattr_destroy, pthread_rwlockattr_t *);
+#ifdef PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP
+XPTHREAD_FUNC2(pthread_rwlockattr_setkind_np, pthread_rwlockattr_t *, int);
+#endif
+
XPTHREAD_FUNC2(pthread_cond_init, pthread_cond_t *, pthread_condattr_t *);
XPTHREAD_FUNC1(pthread_cond_destroy, pthread_cond_t *);
XPTHREAD_FUNC1(pthread_cond_signal, pthread_cond_t *);
XPTHREAD_FUNC1(pthread_cond_broadcast, pthread_cond_t *);
+XPTHREAD_FUNC3(pthread_barrier_init, pthread_barrier_t *,
+ pthread_barrierattr_t *, unsigned int);
+XPTHREAD_FUNC1(pthread_barrier_destroy, pthread_barrier_t *);
+
XPTHREAD_FUNC2(pthread_join, pthread_t, void **);
typedef void destructor_func(void *);
pthread_mutexattr_t attr;
int error;
- l->where = NULL;
+ l->where = "<unlocked>";
xpthread_mutexattr_init(&attr);
xpthread_mutexattr_settype(&attr, type);
error = pthread_mutex_init(&l->lock, &attr);
ovs_mutex_init__(mutex, PTHREAD_MUTEX_RECURSIVE);
}
+/* Initializes 'mutex' as a recursive mutex. */
+void
+ovs_mutex_init_adaptive(const struct ovs_mutex *mutex)
+{
+#ifdef PTHREAD_ADAPTIVE_MUTEX_INITIALIZER_NP
+ ovs_mutex_init__(mutex, PTHREAD_MUTEX_ADAPTIVE_NP);
+#else
+ ovs_mutex_init(mutex);
+#endif
+}
+
void
ovs_rwlock_init(const struct ovs_rwlock *l_)
{
struct ovs_rwlock *l = CONST_CAST(struct ovs_rwlock *, l_);
+ pthread_rwlockattr_t attr;
int error;
- l->where = NULL;
+ l->where = "<unlocked>";
+
+ xpthread_rwlockattr_init(&attr);
+#ifdef PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP
+ xpthread_rwlockattr_setkind_np(
+ &attr, PTHREAD_RWLOCK_PREFER_WRITER_NONRECURSIVE_NP);
+#endif
error = pthread_rwlock_init(&l->lock, NULL);
if (OVS_UNLIKELY(error)) {
ovs_abort(error, "pthread_rwlock_init failed");
}
+ xpthread_rwlockattr_destroy(&attr);
}
void
ovs_mutex_cond_wait(pthread_cond_t *cond, const struct ovs_mutex *mutex_)
{
struct ovs_mutex *mutex = CONST_CAST(struct ovs_mutex *, mutex_);
- int error = pthread_cond_wait(cond, &mutex->lock);
+ int error;
+
+ ovsrcu_quiesce_start();
+ error = pthread_cond_wait(cond, &mutex->lock);
+ ovsrcu_quiesce_end();
+
if (OVS_UNLIKELY(error)) {
ovs_abort(error, "pthread_cond_wait failed");
}
}
+
+int
+xpthread_barrier_wait(pthread_barrier_t *barrier)
+{
+ int error;
+
+ ovsrcu_quiesce_start();
+ error = pthread_barrier_wait(barrier);
+ ovsrcu_quiesce_end();
+
+ if (error && OVS_UNLIKELY(error != PTHREAD_BARRIER_SERIAL_THREAD)) {
+ ovs_abort(error, "pthread_barrier_wait failed");
+ }
+
+ return error;
+}
\f
DEFINE_EXTERN_PER_THREAD_DATA(ovsthread_id, 0);
struct ovsthread_aux {
void *(*start)(void *);
void *arg;
+ char name[16];
};
static void *
aux = *auxp;
free(auxp);
+ /* The order of the following calls is important, because
+ * ovsrcu_quiesce_end() saves a copy of the thread name. */
+ set_subprogram_name("%s%u", aux.name, id);
+ ovsrcu_quiesce_end();
+
return aux.start(aux.arg);
}
-void
-xpthread_create(pthread_t *threadp, pthread_attr_t *attr,
- void *(*start)(void *), void *arg)
+/* Starts a thread that calls 'start(arg)'. Sets the thread's name to 'name'
+ * (suffixed by its ovsthread_id()). Returns the new thread's pthread_t. */
+pthread_t
+ovs_thread_create(const char *name, void *(*start)(void *), void *arg)
{
struct ovsthread_aux *aux;
pthread_t thread;
forbid_forking("multiple threads exist");
multithreaded = true;
+ ovsrcu_quiesce_end();
aux = xmalloc(sizeof *aux);
aux->start = start;
aux->arg = arg;
+ ovs_strlcpy(aux->name, name, sizeof aux->name);
- error = pthread_create(threadp ? threadp : &thread, attr,
- ovsthread_wrapper, aux);
+ error = pthread_create(&thread, NULL, ovsthread_wrapper, aux);
if (error) {
ovs_abort(error, "pthread_create failed");
}
+ return thread;
}
\f
bool
ovs_mutex_unlock(&once->mutex);
}
\f
+bool
+single_threaded(void)
+{
+ return !multithreaded;
+}
+
/* Asserts that the process has not yet created any threads (beyond the initial
* thread).
*
}
}
+#ifndef _WIN32
/* Forks the current process (checking that this is allowed). Aborts with
* VLOG_FATAL if fork() returns an error, and otherwise returns the value
* returned by fork().
}
return pid;
}
+#endif
/* Notes that the process must not call fork() from now on, for the specified
* 'reason'. (The process may still fork() if it execs itself immediately
return !must_not_fork;
}
\f
-/* ovsthread_counter.
- *
- * We implement the counter as an array of N_COUNTERS individual counters, each
- * with its own lock. Each thread uses one of the counters chosen based on a
- * hash of the thread's ID, the idea being that, statistically, different
- * threads will tend to use different counters and therefore avoid
- * interfering with each other.
- *
- * Undoubtedly, better implementations are possible. */
-
-/* Basic counter structure. */
-struct ovsthread_counter__ {
- struct ovs_mutex mutex;
- unsigned long long int value;
-};
-
-/* Pad the basic counter structure to 64 bytes to avoid cache line
- * interference. */
-struct ovsthread_counter {
- struct ovsthread_counter__ c;
- char pad[ROUND_UP(sizeof(struct ovsthread_counter__), 64)
- - sizeof(struct ovsthread_counter__)];
-};
+/* ovsthread_stats. */
-#define N_COUNTERS 16
-
-struct ovsthread_counter *
-ovsthread_counter_create(void)
+void
+ovsthread_stats_init(struct ovsthread_stats *stats)
{
- struct ovsthread_counter *c;
int i;
- c = xmalloc(N_COUNTERS * sizeof *c);
- for (i = 0; i < N_COUNTERS; i++) {
- ovs_mutex_init(&c[i].c.mutex);
- c[i].c.value = 0;
+ ovs_mutex_init(&stats->mutex);
+ for (i = 0; i < ARRAY_SIZE(stats->buckets); i++) {
+ stats->buckets[i] = NULL;
}
- return c;
}
void
-ovsthread_counter_destroy(struct ovsthread_counter *c)
+ovsthread_stats_destroy(struct ovsthread_stats *stats)
{
- if (c) {
- int i;
-
- for (i = 0; i < N_COUNTERS; i++) {
- ovs_mutex_destroy(&c[i].c.mutex);
- }
- free(c);
- }
+ ovs_mutex_destroy(&stats->mutex);
}
-void
-ovsthread_counter_inc(struct ovsthread_counter *c, unsigned long long int n)
+void *
+ovsthread_stats_bucket_get(struct ovsthread_stats *stats,
+ void *(*new_bucket)(void))
{
- c = &c[hash_int(ovsthread_id_self(), 0) % N_COUNTERS];
-
- ovs_mutex_lock(&c->c.mutex);
- c->c.value += n;
- ovs_mutex_unlock(&c->c.mutex);
+ unsigned int idx = ovsthread_id_self() & (ARRAY_SIZE(stats->buckets) - 1);
+ void *bucket = stats->buckets[idx];
+ if (!bucket) {
+ ovs_mutex_lock(&stats->mutex);
+ bucket = stats->buckets[idx];
+ if (!bucket) {
+ bucket = stats->buckets[idx] = new_bucket();
+ }
+ ovs_mutex_unlock(&stats->mutex);
+ }
+ return bucket;
}
-unsigned long long int
-ovsthread_counter_read(const struct ovsthread_counter *c)
+size_t
+ovs_thread_stats_next_bucket(const struct ovsthread_stats *stats, size_t i)
{
- unsigned long long int sum;
- int i;
-
- sum = 0;
- for (i = 0; i < N_COUNTERS; i++) {
- ovs_mutex_lock(&c[i].c.mutex);
- sum += c[i].c.value;
- ovs_mutex_unlock(&c[i].c.mutex);
+ for (; i < ARRAY_SIZE(stats->buckets); i++) {
+ if (stats->buckets[i]) {
+ break;
+ }
}
- return sum;
+ return i;
}
+
\f
/* Parses /proc/cpuinfo for the total number of physical cores on this system
* across all CPU packages, not counting hyper-threads.
static long int n_cores;
if (ovsthread_once_start(&once)) {
+#ifndef _WIN32
parse_cpuinfo(&n_cores);
if (!n_cores) {
n_cores = sysconf(_SC_NPROCESSORS_ONLN);
}
+#else
+ SYSTEM_INFO sysinfo;
+ GetSystemInfo(&sysinfo);
+ n_cores = sysinfo.dwNumberOfProcessors;
+#endif
ovsthread_once_done(&once);
}
git://git.onelab.eu / sliver-openvswitch.git / blobdiff