/
threadpool.c
1656 lines (1424 loc) · 43.5 KB
/
threadpool.c
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/*
* threadpool.c: global thread pool
*
* Authors:
* Dietmar Maurer (dietmar@ximian.com)
* Gonzalo Paniagua Javier (gonzalo@ximian.com)
*
* Copyright 2001-2003 Ximian, Inc (http://www.ximian.com)
* Copyright 2004-2010 Novell, Inc (http://www.novell.com)
* Copyright 2001 Xamarin Inc (http://www.xamarin.com)
*/
#include <config.h>
#include <glib.h>
#include <mono/metadata/profiler-private.h>
#include <mono/metadata/threads.h>
#include <mono/metadata/threads-types.h>
#include <mono/metadata/threadpool-internals.h>
#include <mono/metadata/exception.h>
#include <mono/metadata/environment.h>
#include <mono/metadata/mono-mlist.h>
#include <mono/metadata/mono-perfcounters.h>
#include <mono/metadata/socket-io.h>
#include <mono/metadata/mono-cq.h>
#include <mono/metadata/mono-wsq.h>
#include <mono/metadata/mono-ptr-array.h>
#include <mono/io-layer/io-layer.h>
#include <mono/utils/mono-time.h>
#include <mono/utils/mono-proclib.h>
#include <mono/utils/mono-semaphore.h>
#include <errno.h>
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include <sys/types.h>
#include <fcntl.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <string.h>
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#include <mono/utils/mono-poll.h>
#ifdef HAVE_EPOLL
#include <sys/epoll.h>
#endif
#ifdef HAVE_KQUEUE
#include <sys/event.h>
#endif
#ifndef DISABLE_SOCKETS
#include "mono/io-layer/socket-wrappers.h"
#endif
#include "threadpool.h"
#define THREAD_WANTS_A_BREAK(t) ((t->state & (ThreadState_StopRequested | \
ThreadState_SuspendRequested)) != 0)
#define SPIN_TRYLOCK(i) (InterlockedCompareExchange (&(i), 1, 0) == 0)
#define SPIN_LOCK(i) do { \
if (SPIN_TRYLOCK (i)) \
break; \
} while (1)
#define SPIN_UNLOCK(i) i = 0
#define SMALL_STACK (128 * (sizeof (gpointer) / 4) * 1024)
/* DEBUG: prints tp data every 2s */
#undef DEBUG
/* mono_thread_pool_init called */
static volatile int tp_inited;
enum {
POLL_BACKEND,
EPOLL_BACKEND,
KQUEUE_BACKEND
};
typedef struct {
CRITICAL_SECTION io_lock; /* access to sock_to_state */
int inited; // 0 -> not initialized , 1->initializing, 2->initialized, 3->cleaned up
MonoGHashTable *sock_to_state;
gint event_system;
gpointer event_data;
void (*modify) (gpointer event_data, int fd, int operation, int events, gboolean is_new);
void (*wait) (gpointer sock_data);
void (*shutdown) (gpointer event_data);
} SocketIOData;
static SocketIOData socket_io_data;
/* Keep in sync with the System.MonoAsyncCall class which provides GC tracking */
typedef struct {
MonoObject object;
MonoMethodMessage *msg;
MonoMethod *cb_method;
MonoDelegate *cb_target;
MonoObject *state;
MonoObject *res;
MonoArray *out_args;
} ASyncCall;
typedef struct {
MonoSemType lock;
MonoCQ *queue; /* GC root */
MonoSemType new_job;
volatile gint waiting; /* threads waiting for a work item */
/**/
volatile gint pool_status; /* 0 -> not initialized, 1 -> initialized, 2 -> cleaning up */
/* min, max, n and busy -> Interlocked */
volatile gint min_threads;
volatile gint max_threads;
volatile gint nthreads;
volatile gint busy_threads;
void (*async_invoke) (gpointer data);
void *pc_nitems; /* Performance counter for total number of items in added */
void *pc_nthreads; /* Performance counter for total number of active threads */
/**/
volatile gint destroy_thread;
volatile gint ignore_times; /* Used when there's a thread being created or destroyed */
volatile gint sp_lock; /* spin lock used to protect ignore_times */
volatile gint64 last_check;
volatile gint64 time_sum;
volatile gint n_sum;
gint64 averages [2];
gboolean is_io;
} ThreadPool;
static ThreadPool async_tp;
static ThreadPool async_io_tp;
static void async_invoke_thread (gpointer data);
static MonoObject *mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares);
static void threadpool_free_queue (ThreadPool *tp);
static void threadpool_append_job (ThreadPool *tp, MonoObject *ar);
static void threadpool_append_jobs (ThreadPool *tp, MonoObject **jobs, gint njobs);
static void threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer));
static void threadpool_start_idle_threads (ThreadPool *tp);
static void threadpool_kill_idle_threads (ThreadPool *tp);
static gboolean threadpool_start_thread (ThreadPool *tp);
static void monitor_thread (gpointer data);
static void socket_io_cleanup (SocketIOData *data);
static MonoObject *get_io_event (MonoMList **list, gint event);
static int get_events_from_list (MonoMList *list);
static int get_event_from_state (MonoSocketAsyncResult *state);
static MonoClass *async_call_klass;
static MonoClass *socket_async_call_klass;
static MonoClass *process_async_call_klass;
static GPtrArray *wsqs;
CRITICAL_SECTION wsqs_lock;
/* Hooks */
static MonoThreadPoolFunc tp_start_func;
static MonoThreadPoolFunc tp_finish_func;
static gpointer tp_hooks_user_data;
static MonoThreadPoolItemFunc tp_item_begin_func;
static MonoThreadPoolItemFunc tp_item_end_func;
static gpointer tp_item_user_data;
enum {
AIO_OP_FIRST,
AIO_OP_ACCEPT = 0,
AIO_OP_CONNECT,
AIO_OP_RECEIVE,
AIO_OP_RECEIVEFROM,
AIO_OP_SEND,
AIO_OP_SENDTO,
AIO_OP_RECV_JUST_CALLBACK,
AIO_OP_SEND_JUST_CALLBACK,
AIO_OP_READPIPE,
AIO_OP_CONSOLE2,
AIO_OP_DISCONNECT,
AIO_OP_ACCEPTRECEIVE,
AIO_OP_RECEIVE_BUFFERS,
AIO_OP_SEND_BUFFERS,
AIO_OP_LAST
};
#include <mono/metadata/tpool-poll.c>
#ifdef HAVE_EPOLL
#include <mono/metadata/tpool-epoll.c>
#elif defined(HAVE_KQUEUE)
#include <mono/metadata/tpool-kqueue.c>
#endif
/*
* Functions to check whenever a class is given system class. We need to cache things in MonoDomain since some of the
* assemblies can be unloaded.
*/
static gboolean
is_system_type (MonoDomain *domain, MonoClass *klass)
{
if (domain->system_image == NULL)
domain->system_image = mono_image_loaded ("System");
return klass->image == domain->system_image;
}
static gboolean
is_corlib_type (MonoDomain *domain, MonoClass *klass)
{
return klass->image == mono_defaults.corlib;
}
/*
* Note that we call it is_socket_type() where 'socket' refers to the image
* that contains the System.Net.Sockets.Socket type.
* For moonlight there is a System.Net.Sockets.Socket class in both System.dll and System.Net.dll.
*/
static gboolean
is_socket_type (MonoDomain *domain, MonoClass *klass)
{
static const char *version = NULL;
static gboolean moonlight;
if (is_system_type (domain, klass))
return TRUE;
/* If moonlight, check if the type is in System.Net.dll too */
if (version == NULL) {
version = mono_get_runtime_info ()->framework_version;
moonlight = !strcmp (version, "2.1");
}
if (!moonlight)
return FALSE;
if (domain->system_net_dll == NULL)
domain->system_net_dll = mono_image_loaded ("System.Net");
return klass->image == domain->system_net_dll;
}
#define check_type_cached(domain, ASSEMBLY, _class, _namespace, _name, loc) do { \
if (*loc) \
return *loc == _class; \
if (is_##ASSEMBLY##_type (domain, _class) && !strcmp (_name, _class->name) && !strcmp (_namespace, _class->name_space)) { \
*loc = _class; \
return TRUE; \
} \
return FALSE; \
} while (0) \
#define check_corlib_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, corlib, _class, _namespace, _name, loc)
#define check_socket_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, socket, _class, _namespace, _name, loc)
#define check_system_type_cached(domain, _class, _namespace, _name, loc) check_type_cached (domain, system, _class, _namespace, _name, loc)
static gboolean
is_corlib_asyncresult (MonoDomain *domain, MonoClass *klass)
{
check_corlib_type_cached (domain, klass, "System.Runtime.Remoting.Messaging", "AsyncResult", &domain->corlib_asyncresult_class);
}
static gboolean
is_socket (MonoDomain *domain, MonoClass *klass)
{
check_socket_type_cached (domain, klass, "System.Net.Sockets", "Socket", &domain->socket_class);
}
static gboolean
is_socketasyncresult (MonoDomain *domain, MonoClass *klass)
{
return (klass->nested_in &&
is_socket (domain, klass->nested_in) &&
!strcmp (klass->name, "SocketAsyncResult"));
}
static gboolean
is_socketasynccall (MonoDomain *domain, MonoClass *klass)
{
return (klass->nested_in &&
is_socket (domain, klass->nested_in) &&
!strcmp (klass->name, "SocketAsyncCall"));
}
static gboolean
is_appdomainunloaded_exception (MonoDomain *domain, MonoClass *klass)
{
check_corlib_type_cached (domain, klass, "System", "AppDomainUnloadedException", &domain->ad_unloaded_ex_class);
}
static gboolean
is_sd_process (MonoDomain *domain, MonoClass *klass)
{
check_system_type_cached (domain, klass, "System.Diagnostics", "Process", &domain->process_class);
}
static gboolean
is_sdp_asyncreadhandler (MonoDomain *domain, MonoClass *klass)
{
return (klass->nested_in &&
is_sd_process (domain, klass->nested_in) &&
!strcmp (klass->name, "AsyncReadHandler"));
}
#ifdef DISABLE_SOCKETS
#define socket_io_cleanup(x)
static int
get_event_from_state (MonoSocketAsyncResult *state)
{
g_assert_not_reached ();
return -1;
}
static int
get_events_from_list (MonoMList *list)
{
return 0;
}
#else
static void
socket_io_cleanup (SocketIOData *data)
{
EnterCriticalSection (&data->io_lock);
if (data->inited != 2) {
LeaveCriticalSection (&data->io_lock);
return;
}
data->inited = 3;
data->shutdown (data->event_data);
LeaveCriticalSection (&data->io_lock);
}
static int
get_event_from_state (MonoSocketAsyncResult *state)
{
switch (state->operation) {
case AIO_OP_ACCEPT:
case AIO_OP_RECEIVE:
case AIO_OP_RECV_JUST_CALLBACK:
case AIO_OP_RECEIVEFROM:
case AIO_OP_READPIPE:
case AIO_OP_ACCEPTRECEIVE:
case AIO_OP_RECEIVE_BUFFERS:
return MONO_POLLIN;
case AIO_OP_SEND:
case AIO_OP_SEND_JUST_CALLBACK:
case AIO_OP_SENDTO:
case AIO_OP_CONNECT:
case AIO_OP_SEND_BUFFERS:
case AIO_OP_DISCONNECT:
return MONO_POLLOUT;
default: /* Should never happen */
g_message ("get_event_from_state: unknown value in switch!!!");
return 0;
}
}
static int
get_events_from_list (MonoMList *list)
{
MonoSocketAsyncResult *state;
int events = 0;
while (list && (state = (MonoSocketAsyncResult *)mono_mlist_get_data (list))) {
events |= get_event_from_state (state);
list = mono_mlist_next (list);
}
return events;
}
#define ICALL_RECV(x) ves_icall_System_Net_Sockets_Socket_Receive_internal (\
(SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\
x->socket_flags, &x->error);
#define ICALL_SEND(x) ves_icall_System_Net_Sockets_Socket_Send_internal (\
(SOCKET)(gssize)x->handle, x->buffer, x->offset, x->size,\
x->socket_flags, &x->error);
#endif /* !DISABLE_SOCKETS */
static void
threadpool_jobs_inc (MonoObject *obj)
{
if (obj)
InterlockedIncrement (&obj->vtable->domain->threadpool_jobs);
}
static gboolean
threadpool_jobs_dec (MonoObject *obj)
{
MonoDomain *domain;
int remaining_jobs;
if (obj == NULL)
return FALSE;
domain = obj->vtable->domain;
remaining_jobs = InterlockedDecrement (&domain->threadpool_jobs);
if (remaining_jobs == 0 && domain->cleanup_semaphore) {
ReleaseSemaphore (domain->cleanup_semaphore, 1, NULL);
return TRUE;
}
return FALSE;
}
static MonoObject *
get_io_event (MonoMList **list, gint event)
{
MonoObject *state;
MonoMList *current;
MonoMList *prev;
current = *list;
prev = NULL;
state = NULL;
while (current) {
state = mono_mlist_get_data (current);
if (get_event_from_state ((MonoSocketAsyncResult *) state) == event)
break;
state = NULL;
prev = current;
current = mono_mlist_next (current);
}
if (current) {
if (prev) {
mono_mlist_set_next (prev, mono_mlist_next (current));
} else {
*list = mono_mlist_next (*list);
}
}
return state;
}
/*
* select/poll wake up when a socket is closed, but epoll just removes
* the socket from its internal list without notification.
*/
void
mono_thread_pool_remove_socket (int sock)
{
MonoMList *list;
MonoSocketAsyncResult *state;
MonoObject *ares;
if (socket_io_data.inited == 0)
return;
EnterCriticalSection (&socket_io_data.io_lock);
if (socket_io_data.sock_to_state == NULL) {
LeaveCriticalSection (&socket_io_data.io_lock);
return;
}
list = mono_g_hash_table_lookup (socket_io_data.sock_to_state, GINT_TO_POINTER (sock));
if (list)
mono_g_hash_table_remove (socket_io_data.sock_to_state, GINT_TO_POINTER (sock));
LeaveCriticalSection (&socket_io_data.io_lock);
while (list) {
state = (MonoSocketAsyncResult *) mono_mlist_get_data (list);
if (state->operation == AIO_OP_RECEIVE)
state->operation = AIO_OP_RECV_JUST_CALLBACK;
else if (state->operation == AIO_OP_SEND)
state->operation = AIO_OP_SEND_JUST_CALLBACK;
ares = get_io_event (&list, MONO_POLLIN);
threadpool_append_job (&async_io_tp, ares);
if (list) {
ares = get_io_event (&list, MONO_POLLOUT);
threadpool_append_job (&async_io_tp, ares);
}
}
}
static void
init_event_system (SocketIOData *data)
{
#ifdef HAVE_EPOLL
if (data->event_system == EPOLL_BACKEND) {
data->event_data = tp_epoll_init (data);
if (data->event_data == NULL) {
if (g_getenv ("MONO_DEBUG"))
g_message ("Falling back to poll()");
data->event_system = POLL_BACKEND;
}
}
#elif defined(HAVE_KQUEUE)
if (data->event_system == KQUEUE_BACKEND)
data->event_data = tp_kqueue_init (data);
#endif
if (data->event_system == POLL_BACKEND)
data->event_data = tp_poll_init (data);
}
static void
socket_io_init (SocketIOData *data)
{
int inited;
if (data->inited >= 2) // 2 -> initialized, 3-> cleaned up
return;
inited = InterlockedCompareExchange (&data->inited, 1, 0);
if (inited >= 1) {
while (TRUE) {
if (data->inited >= 2)
return;
SleepEx (1, FALSE);
}
}
EnterCriticalSection (&data->io_lock);
data->sock_to_state = mono_g_hash_table_new_type (g_direct_hash, g_direct_equal, MONO_HASH_VALUE_GC);
#ifdef HAVE_EPOLL
data->event_system = EPOLL_BACKEND;
#elif defined(HAVE_KQUEUE)
data->event_system = KQUEUE_BACKEND;
#else
data->event_system = POLL_BACKEND;
#endif
if (g_getenv ("MONO_DISABLE_AIO") != NULL)
data->event_system = POLL_BACKEND;
init_event_system (data);
mono_thread_create_internal (mono_get_root_domain (), data->wait, data, TRUE, SMALL_STACK);
LeaveCriticalSection (&data->io_lock);
data->inited = 2;
threadpool_start_thread (&async_io_tp);
}
static void
socket_io_add (MonoAsyncResult *ares, MonoSocketAsyncResult *state)
{
MonoMList *list;
SocketIOData *data = &socket_io_data;
int fd;
gboolean is_new;
int ievt;
socket_io_init (&socket_io_data);
if (mono_runtime_is_shutting_down () || data->inited == 3 || data->sock_to_state == NULL)
return;
if (async_tp.pool_status == 2)
return;
MONO_OBJECT_SETREF (state, ares, ares);
fd = GPOINTER_TO_INT (state->handle);
EnterCriticalSection (&data->io_lock);
if (data->sock_to_state == NULL) {
LeaveCriticalSection (&data->io_lock);
return;
}
list = mono_g_hash_table_lookup (data->sock_to_state, GINT_TO_POINTER (fd));
if (list == NULL) {
list = mono_mlist_alloc ((MonoObject*)state);
is_new = TRUE;
} else {
list = mono_mlist_append (list, (MonoObject*)state);
is_new = FALSE;
}
mono_g_hash_table_replace (data->sock_to_state, state->handle, list);
ievt = get_events_from_list (list);
LeaveCriticalSection (&data->io_lock);
data->modify (data->event_data, fd, state->operation, ievt, is_new);
}
#ifndef DISABLE_SOCKETS
static gboolean
socket_io_filter (MonoObject *target, MonoObject *state)
{
gint op;
MonoSocketAsyncResult *sock_res;
MonoClass *klass;
MonoDomain *domain;
if (target == NULL || state == NULL)
return FALSE;
domain = target->vtable->domain;
klass = target->vtable->klass;
if (socket_async_call_klass == NULL && is_socketasynccall (domain, klass))
socket_async_call_klass = klass;
if (process_async_call_klass == NULL && is_sdp_asyncreadhandler (domain, klass))
process_async_call_klass = klass;
if (klass != socket_async_call_klass && klass != process_async_call_klass)
return FALSE;
sock_res = (MonoSocketAsyncResult *) state;
op = sock_res->operation;
if (op < AIO_OP_FIRST || op >= AIO_OP_LAST)
return FALSE;
return TRUE;
}
#endif /* !DISABLE_SOCKETS */
/* Returns the exception thrown when invoking, if any */
static MonoObject *
mono_async_invoke (ThreadPool *tp, MonoAsyncResult *ares)
{
ASyncCall *ac = (ASyncCall *)ares->object_data;
MonoObject *res, *exc = NULL;
MonoArray *out_args = NULL;
HANDLE wait_event = NULL;
if (ares->execution_context) {
/* use captured ExecutionContext (if available) */
MONO_OBJECT_SETREF (ares, original_context, mono_thread_get_execution_context ());
mono_thread_set_execution_context (ares->execution_context);
} else {
ares->original_context = NULL;
}
if (ac == NULL) {
/* Fast path from ThreadPool.*QueueUserWorkItem */
void *pa = ares->async_state;
mono_runtime_delegate_invoke (ares->async_delegate, &pa, &exc);
} else {
MonoObject *cb_exc = NULL;
ac->msg->exc = NULL;
res = mono_message_invoke (ares->async_delegate, ac->msg, &exc, &out_args);
MONO_OBJECT_SETREF (ac, res, res);
MONO_OBJECT_SETREF (ac, msg->exc, exc);
MONO_OBJECT_SETREF (ac, out_args, out_args);
mono_monitor_enter ((MonoObject *) ares);
ares->completed = 1;
if (ares->handle != NULL)
wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle);
mono_monitor_exit ((MonoObject *) ares);
/* notify listeners */
if (wait_event != NULL)
SetEvent (wait_event);
/* call async callback if cb_method != null*/
if (ac != NULL && ac->cb_method) {
void *pa = &ares;
cb_exc = NULL;
mono_runtime_invoke (ac->cb_method, ac->cb_target, pa, &cb_exc);
MONO_OBJECT_SETREF (ac->msg, exc, cb_exc);
exc = cb_exc;
} else {
exc = NULL;
}
}
/* restore original thread execution context if flow isn't suppressed, i.e. non null */
if (ares->original_context) {
mono_thread_set_execution_context (ares->original_context);
ares->original_context = NULL;
}
return exc;
}
static void
threadpool_start_idle_threads (ThreadPool *tp)
{
int n;
guint32 stack_size;
stack_size = (!tp->is_io) ? 0 : SMALL_STACK;
do {
while (1) {
n = tp->nthreads;
if (n >= tp->min_threads)
return;
if (InterlockedCompareExchange (&tp->nthreads, n + 1, n) == n)
break;
}
mono_perfcounter_update_value (tp->pc_nthreads, TRUE, 1);
mono_thread_create_internal (mono_get_root_domain (), tp->async_invoke, tp, TRUE, stack_size);
SleepEx (100, TRUE);
} while (1);
}
static void
threadpool_init (ThreadPool *tp, int min_threads, int max_threads, void (*async_invoke) (gpointer))
{
memset (tp, 0, sizeof (ThreadPool));
tp->min_threads = min_threads;
tp->max_threads = max_threads;
tp->async_invoke = async_invoke;
tp->queue = mono_cq_create ();
MONO_SEM_INIT (&tp->new_job, 0);
}
static void *
init_perf_counter (const char *category, const char *counter)
{
MonoString *category_str;
MonoString *counter_str;
MonoString *machine;
MonoDomain *root;
MonoBoolean custom;
int type;
if (category == NULL || counter == NULL)
return NULL;
root = mono_get_root_domain ();
category_str = mono_string_new (root, category);
counter_str = mono_string_new (root, counter);
machine = mono_string_new (root, ".");
return mono_perfcounter_get_impl (category_str, counter_str, NULL, machine, &type, &custom);
}
#ifdef DEBUG
static void
print_pool_info (ThreadPool *tp)
{
// if (tp->tail - tp->head == 0)
// return;
g_print ("Pool status? %d\n", InterlockedCompareExchange (&tp->pool_status, 0, 0));
g_print ("Min. threads: %d\n", InterlockedCompareExchange (&tp->min_threads, 0, 0));
g_print ("Max. threads: %d\n", InterlockedCompareExchange (&tp->max_threads, 0, 0));
g_print ("nthreads: %d\n", InterlockedCompareExchange (&tp->nthreads, 0, 0));
g_print ("busy threads: %d\n", InterlockedCompareExchange (&tp->busy_threads, 0, 0));
g_print ("Waiting: %d\n", InterlockedCompareExchange (&tp->waiting, 0, 0));
g_print ("Queued: %d\n", (tp->tail - tp->head));
if (tp == &async_tp) {
int i;
EnterCriticalSection (&wsqs_lock);
for (i = 0; i < wsqs->len; i++) {
g_print ("\tWSQ %d: %d\n", i, mono_wsq_count (g_ptr_array_index (wsqs, i)));
}
LeaveCriticalSection (&wsqs_lock);
} else {
g_print ("\tSockets: %d\n", mono_g_hash_table_size (socket_io_data.sock_to_state));
}
g_print ("-------------\n");
}
static void
signal_handler (int signo)
{
ThreadPool *tp;
tp = &async_tp;
g_print ("\n-----Non-IO-----\n");
print_pool_info (tp);
tp = &async_io_tp;
g_print ("\n-----IO-----\n");
print_pool_info (tp);
alarm (2);
}
#endif
static void
monitor_thread (gpointer unused)
{
ThreadPool *pools [2];
MonoInternalThread *thread;
guint32 ms;
gboolean need_one;
int i;
pools [0] = &async_tp;
pools [1] = &async_io_tp;
thread = mono_thread_internal_current ();
ves_icall_System_Threading_Thread_SetName_internal (thread, mono_string_new (mono_domain_get (), "Threadpool monitor"));
while (1) {
ms = 500;
do {
guint32 ts;
ts = mono_msec_ticks ();
if (SleepEx (ms, TRUE) == 0)
break;
ms -= (mono_msec_ticks () - ts);
if (mono_runtime_is_shutting_down ())
break;
if (THREAD_WANTS_A_BREAK (thread))
mono_thread_interruption_checkpoint ();
} while (ms > 0);
if (mono_runtime_is_shutting_down ())
break;
for (i = 0; i < 2; i++) {
ThreadPool *tp;
tp = pools [i];
if (tp->waiting > 0)
continue;
need_one = (mono_cq_count (tp->queue) > 0);
if (!need_one && !tp->is_io) {
EnterCriticalSection (&wsqs_lock);
for (i = 0; wsqs != NULL && i < wsqs->len; i++) {
MonoWSQ *wsq;
wsq = g_ptr_array_index (wsqs, i);
if (mono_wsq_count (wsq) != 0) {
need_one = TRUE;
break;
}
}
LeaveCriticalSection (&wsqs_lock);
}
if (need_one)
threadpool_start_thread (tp);
}
}
}
void
mono_thread_pool_init ()
{
gint threads_per_cpu = 1;
gint thread_count;
gint cpu_count = mono_cpu_count ();
int result;
if (tp_inited == 2)
return;
result = InterlockedCompareExchange (&tp_inited, 1, 0);
if (result == 1) {
while (1) {
SleepEx (1, FALSE);
if (tp_inited == 2)
return;
}
}
MONO_GC_REGISTER_ROOT_FIXED (socket_io_data.sock_to_state);
InitializeCriticalSection (&socket_io_data.io_lock);
if (g_getenv ("MONO_THREADS_PER_CPU") != NULL) {
threads_per_cpu = atoi (g_getenv ("MONO_THREADS_PER_CPU"));
if (threads_per_cpu < 1)
threads_per_cpu = 1;
}
thread_count = MIN (cpu_count * threads_per_cpu, 100 * cpu_count);
threadpool_init (&async_tp, thread_count, MAX (100 * cpu_count, thread_count), async_invoke_thread);
threadpool_init (&async_io_tp, cpu_count * 2, cpu_count * 4, async_invoke_thread);
async_io_tp.is_io = TRUE;
async_call_klass = mono_class_from_name (mono_defaults.corlib, "System", "MonoAsyncCall");
g_assert (async_call_klass);
InitializeCriticalSection (&wsqs_lock);
wsqs = g_ptr_array_sized_new (MAX (100 * cpu_count, thread_count));
mono_wsq_init ();
async_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "Work Items Added");
g_assert (async_tp.pc_nitems);
async_io_tp.pc_nitems = init_perf_counter ("Mono Threadpool", "IO Work Items Added");
g_assert (async_io_tp.pc_nitems);
async_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of Threads");
g_assert (async_tp.pc_nthreads);
async_io_tp.pc_nthreads = init_perf_counter ("Mono Threadpool", "# of IO Threads");
g_assert (async_io_tp.pc_nthreads);
tp_inited = 2;
#ifdef DEBUG
signal (SIGALRM, signal_handler);
alarm (2);
#endif
}
static MonoAsyncResult *
create_simple_asyncresult (MonoObject *target, MonoObject *state)
{
MonoDomain *domain = mono_domain_get ();
MonoAsyncResult *ares;
/* Don't call mono_async_result_new() to avoid capturing the context */
ares = (MonoAsyncResult *) mono_object_new (domain, mono_defaults.asyncresult_class);
MONO_OBJECT_SETREF (ares, async_delegate, target);
MONO_OBJECT_SETREF (ares, async_state, state);
return ares;
}
void
icall_append_io_job (MonoObject *target, MonoSocketAsyncResult *state)
{
MonoAsyncResult *ares;
ares = create_simple_asyncresult (target, (MonoObject *) state);
socket_io_add (ares, state);
}
MonoAsyncResult *
mono_thread_pool_add (MonoObject *target, MonoMethodMessage *msg, MonoDelegate *async_callback,
MonoObject *state)
{
MonoDomain *domain = mono_domain_get ();
MonoAsyncResult *ares;
ASyncCall *ac;
ac = (ASyncCall*)mono_object_new (domain, async_call_klass);
MONO_OBJECT_SETREF (ac, msg, msg);
MONO_OBJECT_SETREF (ac, state, state);
if (async_callback) {
ac->cb_method = mono_get_delegate_invoke (((MonoObject *)async_callback)->vtable->klass);
MONO_OBJECT_SETREF (ac, cb_target, async_callback);
}
ares = mono_async_result_new (domain, NULL, ac->state, NULL, (MonoObject*)ac);
MONO_OBJECT_SETREF (ares, async_delegate, target);
#ifndef DISABLE_SOCKETS
if (socket_io_filter (target, state)) {
socket_io_add (ares, (MonoSocketAsyncResult *) state);
return ares;
}
#endif
threadpool_append_job (&async_tp, (MonoObject *) ares);
return ares;
}
MonoObject *
mono_thread_pool_finish (MonoAsyncResult *ares, MonoArray **out_args, MonoObject **exc)
{
ASyncCall *ac;
HANDLE wait_event;
*exc = NULL;
*out_args = NULL;
/* check if already finished */
mono_monitor_enter ((MonoObject *) ares);
if (ares->endinvoke_called) {
*exc = (MonoObject *) mono_get_exception_invalid_operation (NULL);
mono_monitor_exit ((MonoObject *) ares);
return NULL;
}
ares->endinvoke_called = 1;
/* wait until we are really finished */
if (!ares->completed) {
if (ares->handle == NULL) {
wait_event = CreateEvent (NULL, TRUE, FALSE, NULL);
g_assert(wait_event != 0);
MONO_OBJECT_SETREF (ares, handle, (MonoObject *) mono_wait_handle_new (mono_object_domain (ares), wait_event));
} else {
wait_event = mono_wait_handle_get_handle ((MonoWaitHandle *) ares->handle);
}
mono_monitor_exit ((MonoObject *) ares);
WaitForSingleObjectEx (wait_event, INFINITE, TRUE);
} else {
mono_monitor_exit ((MonoObject *) ares);
}
ac = (ASyncCall *) ares->object_data;
g_assert (ac != NULL);
*exc = ac->msg->exc; /* FIXME: GC add write barrier */
*out_args = ac->out_args;
return ac->res;
}
static void
threadpool_kill_idle_threads (ThreadPool *tp)
{
gint n;
n = (gint) InterlockedCompareExchange (&tp->max_threads, 0, -1);
while (n) {
n--;
MONO_SEM_POST (&tp->new_job);
}
}
void
mono_thread_pool_cleanup (void)
{
if (InterlockedExchange (&async_io_tp.pool_status, 2) == 1) {
socket_io_cleanup (&socket_io_data); /* Empty when DISABLE_SOCKETS is defined */
threadpool_kill_idle_threads (&async_io_tp);
}
if (async_io_tp.queue != NULL) {
MONO_SEM_DESTROY (&async_io_tp.new_job);
threadpool_free_queue (&async_io_tp);
}
if (InterlockedExchange (&async_tp.pool_status, 2) == 1) {
threadpool_kill_idle_threads (&async_tp);
threadpool_free_queue (&async_tp);