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//
//
// Copyright 2015 gRPC authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
//
// Posix implementation for gpr threads.
#include <grpc/support/port_platform.h>
#include <util/system/thread.h>
#include <util/generic/string.h>
#include <util/string/cast.h>
#include <grpc/support/time.h>
#ifdef GPR_POSIX_SYNC
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <grpc/support/log.h>
#include <grpc/support/sync.h>
#include <grpc/support/thd_id.h>
#include "src/core/lib/gpr/useful.h"
#include "src/core/lib/gprpp/crash.h"
#include "src/core/lib/gprpp/fork.h"
#include "src/core/lib/gprpp/strerror.h"
#include "src/core/lib/gprpp/thd.h"
namespace grpc_core {
namespace {
class ThreadInternalsPosix;
struct thd_arg {
ThreadInternalsPosix* thread;
void (*body)(void* arg); // body of a thread
void* arg; // argument to a thread
const char* name; // name of thread. Can be nullptr.
bool joinable;
bool tracked;
};
size_t RoundUpToPageSize(size_t size) {
// TODO(yunjiaw): Change this variable (page_size) to a function-level static
// when possible
size_t page_size = static_cast<size_t>(sysconf(_SC_PAGESIZE));
return (size + page_size - 1) & ~(page_size - 1);
}
// Returns the minimum valid stack size that can be passed to
// pthread_attr_setstacksize.
size_t MinValidStackSize(size_t request_size) {
size_t min_stacksize = sysconf(_SC_THREAD_STACK_MIN);
if (request_size < min_stacksize) {
request_size = min_stacksize;
}
// On some systems, pthread_attr_setstacksize() can fail if stacksize is
// not a multiple of the system page size.
return RoundUpToPageSize(request_size);
}
class ThreadInternalsPosix : public internal::ThreadInternalsInterface {
public:
ThreadInternalsPosix(const char* thd_name, void (*thd_body)(void* arg),
void* arg, bool* success, const Thread::Options& options)
: started_(false) {
gpr_mu_init(&mu_);
gpr_cv_init(&ready_);
pthread_attr_t attr;
// don't use gpr_malloc as we may cause an infinite recursion with
// the profiling code
thd_arg* info = static_cast<thd_arg*>(malloc(sizeof(*info)));
GPR_ASSERT(info != nullptr);
info->thread = this;
info->body = thd_body;
info->arg = arg;
info->name = thd_name;
info->joinable = options.joinable();
info->tracked = options.tracked();
if (options.tracked()) {
Fork::IncThreadCount();
}
GPR_ASSERT(pthread_attr_init(&attr) == 0);
if (options.joinable()) {
GPR_ASSERT(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE) ==
0);
} else {
GPR_ASSERT(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) ==
0);
}
if (options.stack_size() != 0) {
size_t stack_size = MinValidStackSize(options.stack_size());
GPR_ASSERT(pthread_attr_setstacksize(&attr, stack_size) == 0);
}
int pthread_create_err = pthread_create(
&pthread_id_, &attr,
[](void* v) -> void* {
thd_arg arg = *static_cast<thd_arg*>(v);
free(v);
if (arg.name != nullptr) {
TThread::SetCurrentThreadName(arg.name);
}
gpr_mu_lock(&arg.thread->mu_);
while (!arg.thread->started_) {
gpr_cv_wait(&arg.thread->ready_, &arg.thread->mu_,
gpr_inf_future(GPR_CLOCK_MONOTONIC));
}
gpr_mu_unlock(&arg.thread->mu_);
if (!arg.joinable) {
delete arg.thread;
}
(*arg.body)(arg.arg);
if (arg.tracked) {
Fork::DecThreadCount();
}
return nullptr;
},
info);
*success = (pthread_create_err == 0);
GPR_ASSERT(pthread_attr_destroy(&attr) == 0);
if (!(*success)) {
gpr_log(GPR_ERROR, "pthread_create failed: %s",
StrError(pthread_create_err).c_str());
// don't use gpr_free, as this was allocated using malloc (see above)
free(info);
if (options.tracked()) {
Fork::DecThreadCount();
}
}
}
~ThreadInternalsPosix() override {
gpr_mu_destroy(&mu_);
gpr_cv_destroy(&ready_);
}
void Start() override {
gpr_mu_lock(&mu_);
started_ = true;
gpr_cv_signal(&ready_);
gpr_mu_unlock(&mu_);
}
void Join() override {
int pthread_join_err = pthread_join(pthread_id_, nullptr);
if (pthread_join_err != 0) {
Crash("pthread_join failed: " + StrError(pthread_join_err));
}
}
private:
gpr_mu mu_;
gpr_cv ready_;
bool started_;
pthread_t pthread_id_;
};
} // namespace
Thread::Thread(const char* thd_name, void (*thd_body)(void* arg), void* arg,
bool* success, const Options& options)
: options_(options) {
bool outcome = false;
impl_ = new ThreadInternalsPosix(thd_name, thd_body, arg, &outcome, options);
if (outcome) {
state_ = ALIVE;
} else {
state_ = FAILED;
delete impl_;
impl_ = nullptr;
}
if (success != nullptr) {
*success = outcome;
}
}
} // namespace grpc_core
// The following is in the external namespace as it is exposed as C89 API
gpr_thd_id gpr_thd_currentid(void) {
// Use C-style casting because Linux and OSX have different definitions
// of pthread_t so that a single C++ cast doesn't handle it.
// NOLINTNEXTLINE(google-readability-casting)
return (gpr_thd_id)pthread_self();
}
#endif // GPR_POSIX_SYNC
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