mirror of
https://github.com/dart-lang/sdk
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f9a6a5bdd2
TEST=build Change-Id: I2834ef7cf7cb7c8770f8167a2438cbedcee5c623 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/292063 Commit-Queue: Ryan Macnak <rmacnak@google.com> Reviewed-by: Alexander Aprelev <aam@google.com>
516 lines
16 KiB
C++
516 lines
16 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#include "platform/globals.h" // NOLINT
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#if defined(DART_HOST_OS_LINUX) && !defined(DART_USE_ABSL)
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#include "vm/os_thread.h"
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#include <errno.h> // NOLINT
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#include <stdio.h>
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#include <sys/resource.h> // NOLINT
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#include <sys/syscall.h> // NOLINT
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#include <sys/time.h> // NOLINT
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#include "platform/address_sanitizer.h"
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#include "platform/assert.h"
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#include "platform/safe_stack.h"
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#include "platform/signal_blocker.h"
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#include "platform/utils.h"
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#include "vm/flags.h"
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namespace dart {
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DEFINE_FLAG(int,
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worker_thread_priority,
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kMinInt,
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"The thread priority the VM should use for new worker threads.");
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#define VALIDATE_PTHREAD_RESULT(result) \
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if (result != 0) { \
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const int kBufferSize = 1024; \
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char error_buf[kBufferSize]; \
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FATAL("pthread error: %d (%s)", result, \
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Utils::StrError(result, error_buf, kBufferSize)); \
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}
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// Variation of VALIDATE_PTHREAD_RESULT for named objects.
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#if defined(PRODUCT)
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#define VALIDATE_PTHREAD_RESULT_NAMED(result) VALIDATE_PTHREAD_RESULT(result)
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#else
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#define VALIDATE_PTHREAD_RESULT_NAMED(result) \
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if (result != 0) { \
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const int kBufferSize = 1024; \
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char error_buf[kBufferSize]; \
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FATAL("[%s] pthread error: %d (%s)", name_, result, \
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Utils::StrError(result, error_buf, kBufferSize)); \
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}
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#endif
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#if defined(DEBUG)
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#define ASSERT_PTHREAD_SUCCESS(result) VALIDATE_PTHREAD_RESULT(result)
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#else
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// NOTE: This (currently) expands to a no-op.
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#define ASSERT_PTHREAD_SUCCESS(result) ASSERT(result == 0)
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#endif
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#ifdef DEBUG
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#define RETURN_ON_PTHREAD_FAILURE(result) \
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if (result != 0) { \
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const int kBufferSize = 1024; \
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char error_buf[kBufferSize]; \
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fprintf(stderr, "%s:%d: pthread error: %d (%s)\n", __FILE__, __LINE__, \
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result, Utils::StrError(result, error_buf, kBufferSize)); \
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return result; \
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}
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#else
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#define RETURN_ON_PTHREAD_FAILURE(result) \
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if (result != 0) return result;
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#endif
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static void ComputeTimeSpecMicros(struct timespec* ts, int64_t micros) {
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int64_t secs = micros / kMicrosecondsPerSecond;
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int64_t nanos =
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(micros - (secs * kMicrosecondsPerSecond)) * kNanosecondsPerMicrosecond;
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int result = clock_gettime(CLOCK_MONOTONIC, ts);
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ASSERT(result == 0);
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ts->tv_sec += secs;
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ts->tv_nsec += nanos;
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if (ts->tv_nsec >= kNanosecondsPerSecond) {
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ts->tv_sec += 1;
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ts->tv_nsec -= kNanosecondsPerSecond;
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}
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}
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class ThreadStartData {
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public:
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ThreadStartData(const char* name,
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OSThread::ThreadStartFunction function,
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uword parameter)
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: name_(name), function_(function), parameter_(parameter) {}
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const char* name() const { return name_; }
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OSThread::ThreadStartFunction function() const { return function_; }
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uword parameter() const { return parameter_; }
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private:
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const char* name_;
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OSThread::ThreadStartFunction function_;
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uword parameter_;
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DISALLOW_COPY_AND_ASSIGN(ThreadStartData);
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};
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// TODO(bkonyi): remove this call once the prebuilt SDK is updated.
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// Spawned threads inherit their spawner's signal mask. We sometimes spawn
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// threads for running Dart code from a thread that is blocking SIGPROF.
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// This function explicitly unblocks SIGPROF so the profiler continues to
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// sample this thread.
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static void UnblockSIGPROF() {
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sigset_t set;
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sigemptyset(&set);
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sigaddset(&set, SIGPROF);
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int r = pthread_sigmask(SIG_UNBLOCK, &set, nullptr);
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USE(r);
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ASSERT(r == 0);
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ASSERT(!CHECK_IS_BLOCKING(SIGPROF));
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}
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// Dispatch to the thread start function provided by the caller. This trampoline
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// is used to ensure that the thread is properly destroyed if the thread just
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// exits.
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static void* ThreadStart(void* data_ptr) {
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if (FLAG_worker_thread_priority != kMinInt) {
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if (setpriority(PRIO_PROCESS, syscall(__NR_gettid),
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FLAG_worker_thread_priority) == -1) {
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FATAL("Setting thread priority to %d failed: errno = %d\n",
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FLAG_worker_thread_priority, errno);
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}
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}
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ThreadStartData* data = reinterpret_cast<ThreadStartData*>(data_ptr);
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const char* name = data->name();
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OSThread::ThreadStartFunction function = data->function();
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uword parameter = data->parameter();
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delete data;
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// Set the thread name. There is 16 bytes limit on the name (including \0).
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// pthread_setname_np ignores names that are too long rather than truncating.
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char truncated_name[16];
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snprintf(truncated_name, ARRAY_SIZE(truncated_name), "%s", name);
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pthread_setname_np(pthread_self(), truncated_name);
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// Create new OSThread object and set as TLS for new thread.
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OSThread* thread = OSThread::CreateOSThread();
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if (thread != nullptr) {
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OSThread::SetCurrent(thread);
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thread->SetName(name);
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UnblockSIGPROF();
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// Call the supplied thread start function handing it its parameters.
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function(parameter);
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}
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return nullptr;
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}
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int OSThread::Start(const char* name,
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ThreadStartFunction function,
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uword parameter) {
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pthread_attr_t attr;
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int result = pthread_attr_init(&attr);
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RETURN_ON_PTHREAD_FAILURE(result);
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result = pthread_attr_setstacksize(&attr, OSThread::GetMaxStackSize());
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RETURN_ON_PTHREAD_FAILURE(result);
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ThreadStartData* data = new ThreadStartData(name, function, parameter);
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pthread_t tid;
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result = pthread_create(&tid, &attr, ThreadStart, data);
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RETURN_ON_PTHREAD_FAILURE(result);
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result = pthread_attr_destroy(&attr);
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RETURN_ON_PTHREAD_FAILURE(result);
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return 0;
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}
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const ThreadId OSThread::kInvalidThreadId = static_cast<ThreadId>(0);
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const ThreadJoinId OSThread::kInvalidThreadJoinId =
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static_cast<ThreadJoinId>(0);
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ThreadLocalKey OSThread::CreateThreadLocal(ThreadDestructor destructor) {
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pthread_key_t key = kUnsetThreadLocalKey;
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int result = pthread_key_create(&key, destructor);
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VALIDATE_PTHREAD_RESULT(result);
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ASSERT(key != kUnsetThreadLocalKey);
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return key;
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}
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void OSThread::DeleteThreadLocal(ThreadLocalKey key) {
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ASSERT(key != kUnsetThreadLocalKey);
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int result = pthread_key_delete(key);
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VALIDATE_PTHREAD_RESULT(result);
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}
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void OSThread::SetThreadLocal(ThreadLocalKey key, uword value) {
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ASSERT(key != kUnsetThreadLocalKey);
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int result = pthread_setspecific(key, reinterpret_cast<void*>(value));
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VALIDATE_PTHREAD_RESULT(result);
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}
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intptr_t OSThread::GetMaxStackSize() {
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const int kStackSize = (128 * kWordSize * KB);
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return kStackSize;
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}
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ThreadId OSThread::GetCurrentThreadId() {
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return pthread_self();
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}
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#ifdef SUPPORT_TIMELINE
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ThreadId OSThread::GetCurrentThreadTraceId() {
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return syscall(__NR_gettid);
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}
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#endif // SUPPORT_TIMELINE
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char* OSThread::GetCurrentThreadName() {
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const intptr_t kNameBufferSize = 16;
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char* name = static_cast<char*>(malloc(kNameBufferSize));
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pthread_getname_np(pthread_self(), name, kNameBufferSize);
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return name;
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}
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ThreadJoinId OSThread::GetCurrentThreadJoinId(OSThread* thread) {
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ASSERT(thread != nullptr);
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// Make sure we're filling in the join id for the current thread.
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ASSERT(thread->id() == GetCurrentThreadId());
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// Make sure the join_id_ hasn't been set, yet.
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DEBUG_ASSERT(thread->join_id_ == kInvalidThreadJoinId);
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pthread_t id = pthread_self();
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#if defined(DEBUG)
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thread->join_id_ = id;
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#endif
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return id;
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}
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void OSThread::Join(ThreadJoinId id) {
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int result = pthread_join(id, nullptr);
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ASSERT(result == 0);
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}
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intptr_t OSThread::ThreadIdToIntPtr(ThreadId id) {
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COMPILE_ASSERT(sizeof(id) <= sizeof(intptr_t));
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return static_cast<intptr_t>(id);
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}
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ThreadId OSThread::ThreadIdFromIntPtr(intptr_t id) {
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return static_cast<ThreadId>(id);
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}
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bool OSThread::Compare(ThreadId a, ThreadId b) {
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return pthread_equal(a, b) != 0;
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}
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bool OSThread::GetCurrentStackBounds(uword* lower, uword* upper) {
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pthread_attr_t attr;
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// May fail on the main thread.
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if (pthread_getattr_np(pthread_self(), &attr) != 0) {
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return false;
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}
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void* base;
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size_t size;
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int error = pthread_attr_getstack(&attr, &base, &size);
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pthread_attr_destroy(&attr);
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if (error != 0) {
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return false;
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}
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*lower = reinterpret_cast<uword>(base);
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*upper = *lower + size;
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return true;
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}
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#if defined(USING_SAFE_STACK)
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NO_SANITIZE_ADDRESS
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NO_SANITIZE_SAFE_STACK
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uword OSThread::GetCurrentSafestackPointer() {
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#error "SAFE_STACK is unsupported on this platform"
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return 0;
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}
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NO_SANITIZE_ADDRESS
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NO_SANITIZE_SAFE_STACK
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void OSThread::SetCurrentSafestackPointer(uword ssp) {
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#error "SAFE_STACK is unsupported on this platform"
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}
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#endif
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Mutex::Mutex(NOT_IN_PRODUCT(const char* name))
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#if !defined(PRODUCT)
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: name_(name)
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#endif
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{
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pthread_mutexattr_t attr;
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int result = pthread_mutexattr_init(&attr);
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VALIDATE_PTHREAD_RESULT_NAMED(result);
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#if defined(DEBUG)
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result = pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
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VALIDATE_PTHREAD_RESULT_NAMED(result);
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#endif // defined(DEBUG)
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result = pthread_mutex_init(data_.mutex(), &attr);
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// Verify that creating a pthread_mutex succeeded.
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VALIDATE_PTHREAD_RESULT_NAMED(result);
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result = pthread_mutexattr_destroy(&attr);
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VALIDATE_PTHREAD_RESULT_NAMED(result);
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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owner_ = OSThread::kInvalidThreadId;
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#endif // defined(DEBUG)
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}
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Mutex::~Mutex() {
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int result = pthread_mutex_destroy(data_.mutex());
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// Verify that the pthread_mutex was destroyed.
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VALIDATE_PTHREAD_RESULT_NAMED(result);
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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ASSERT(owner_ == OSThread::kInvalidThreadId);
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#endif // defined(DEBUG)
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}
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void Mutex::Lock() {
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DEBUG_ASSERT(!ThreadInterruptScope::in_thread_interrupt_scope());
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int result = pthread_mutex_lock(data_.mutex());
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// Specifically check for dead lock to help debugging.
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ASSERT(result != EDEADLK);
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ASSERT_PTHREAD_SUCCESS(result); // Verify no other errors.
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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owner_ = OSThread::GetCurrentThreadId();
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#endif // defined(DEBUG)
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}
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bool Mutex::TryLock() {
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DEBUG_ASSERT(!ThreadInterruptScope::in_thread_interrupt_scope());
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int result = pthread_mutex_trylock(data_.mutex());
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// Return false if the lock is busy and locking failed.
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if (result == EBUSY) {
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return false;
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}
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ASSERT_PTHREAD_SUCCESS(result); // Verify no other errors.
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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owner_ = OSThread::GetCurrentThreadId();
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#endif // defined(DEBUG)
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return true;
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}
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void Mutex::Unlock() {
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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ASSERT(IsOwnedByCurrentThread());
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owner_ = OSThread::kInvalidThreadId;
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#endif // defined(DEBUG)
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int result = pthread_mutex_unlock(data_.mutex());
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// Specifically check for wrong thread unlocking to aid debugging.
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ASSERT(result != EPERM);
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ASSERT_PTHREAD_SUCCESS(result); // Verify no other errors.
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}
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Monitor::Monitor() {
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pthread_mutexattr_t mutex_attr;
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int result = pthread_mutexattr_init(&mutex_attr);
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VALIDATE_PTHREAD_RESULT(result);
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#if defined(DEBUG)
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result = pthread_mutexattr_settype(&mutex_attr, PTHREAD_MUTEX_ERRORCHECK);
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VALIDATE_PTHREAD_RESULT(result);
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#endif // defined(DEBUG)
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result = pthread_mutex_init(data_.mutex(), &mutex_attr);
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VALIDATE_PTHREAD_RESULT(result);
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result = pthread_mutexattr_destroy(&mutex_attr);
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VALIDATE_PTHREAD_RESULT(result);
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pthread_condattr_t cond_attr;
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result = pthread_condattr_init(&cond_attr);
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VALIDATE_PTHREAD_RESULT(result);
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result = pthread_condattr_setclock(&cond_attr, CLOCK_MONOTONIC);
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VALIDATE_PTHREAD_RESULT(result);
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result = pthread_cond_init(data_.cond(), &cond_attr);
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VALIDATE_PTHREAD_RESULT(result);
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result = pthread_condattr_destroy(&cond_attr);
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VALIDATE_PTHREAD_RESULT(result);
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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owner_ = OSThread::kInvalidThreadId;
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#endif // defined(DEBUG)
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}
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Monitor::~Monitor() {
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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ASSERT(owner_ == OSThread::kInvalidThreadId);
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#endif // defined(DEBUG)
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int result = pthread_mutex_destroy(data_.mutex());
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VALIDATE_PTHREAD_RESULT(result);
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result = pthread_cond_destroy(data_.cond());
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VALIDATE_PTHREAD_RESULT(result);
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}
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bool Monitor::TryEnter() {
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DEBUG_ASSERT(!ThreadInterruptScope::in_thread_interrupt_scope());
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int result = pthread_mutex_trylock(data_.mutex());
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// Return false if the lock is busy and locking failed.
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if (result == EBUSY) {
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return false;
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}
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ASSERT_PTHREAD_SUCCESS(result); // Verify no other errors.
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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ASSERT(owner_ == OSThread::kInvalidThreadId);
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owner_ = OSThread::GetCurrentThreadId();
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#endif // defined(DEBUG)
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return true;
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}
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void Monitor::Enter() {
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DEBUG_ASSERT(!ThreadInterruptScope::in_thread_interrupt_scope());
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int result = pthread_mutex_lock(data_.mutex());
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VALIDATE_PTHREAD_RESULT(result);
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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ASSERT(owner_ == OSThread::kInvalidThreadId);
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owner_ = OSThread::GetCurrentThreadId();
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#endif // defined(DEBUG)
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}
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void Monitor::Exit() {
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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ASSERT(IsOwnedByCurrentThread());
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owner_ = OSThread::kInvalidThreadId;
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#endif // defined(DEBUG)
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int result = pthread_mutex_unlock(data_.mutex());
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VALIDATE_PTHREAD_RESULT(result);
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}
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Monitor::WaitResult Monitor::Wait(int64_t millis) {
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Monitor::WaitResult retval = WaitMicros(millis * kMicrosecondsPerMillisecond);
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return retval;
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}
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Monitor::WaitResult Monitor::WaitMicros(int64_t micros) {
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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ASSERT(IsOwnedByCurrentThread());
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ThreadId saved_owner = owner_;
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owner_ = OSThread::kInvalidThreadId;
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#endif // defined(DEBUG)
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Monitor::WaitResult retval = kNotified;
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if (micros == kNoTimeout) {
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// Wait forever.
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int result = pthread_cond_wait(data_.cond(), data_.mutex());
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VALIDATE_PTHREAD_RESULT(result);
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} else {
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struct timespec ts;
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ComputeTimeSpecMicros(&ts, micros);
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int result = pthread_cond_timedwait(data_.cond(), data_.mutex(), &ts);
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ASSERT((result == 0) || (result == ETIMEDOUT));
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if (result == ETIMEDOUT) {
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retval = kTimedOut;
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}
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}
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#if defined(DEBUG)
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// When running with assertions enabled we track the owner.
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ASSERT(owner_ == OSThread::kInvalidThreadId);
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owner_ = OSThread::GetCurrentThreadId();
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ASSERT(owner_ == saved_owner);
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#endif // defined(DEBUG)
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return retval;
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}
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void Monitor::Notify() {
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// When running with assertions enabled we track the owner.
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ASSERT(IsOwnedByCurrentThread());
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int result = pthread_cond_signal(data_.cond());
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VALIDATE_PTHREAD_RESULT(result);
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}
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void Monitor::NotifyAll() {
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// When running with assertions enabled we track the owner.
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ASSERT(IsOwnedByCurrentThread());
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int result = pthread_cond_broadcast(data_.cond());
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VALIDATE_PTHREAD_RESULT(result);
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}
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} // namespace dart
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#endif // defined(DART_HOST_OS_LINUX) && !defined(DART_USE_ABSL)
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