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140 lines (118 loc) · 3.49 KB
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/**
* \file python_module/src/cpp/function_replace.cpp
*
* This file is part of MegBrain, a deep learning framework developed by Megvii.
*
* \brief replace functions in megbrain core
*
* \copyright Copyright (c) 2014-2020 Megvii Inc. All rights reserved.
*
*/
#include "./megbrain_wrap.h"
#include "./python_helper.h"
#include "megbrain/utils/debug.h"
#include "megbrain/common.h"
#include "megbrain/system.h"
#include <stdexcept>
#include <cstring>
#include <cstdarg>
#include <Python.h>
#include <unistd.h>
namespace {
PyObject *logger = nullptr;
#if MGB_ENABLE_DEBUG_UTIL
void throw_fork_cuda_exc() {
// set python error state, so when returning to parent process that calls
// fork(), an exception could be raised
//
// call chain:
// python -> fork() -> pthread_atfork -> CudaCheckOnFork ->
// ForkAfterCudaError::throw_
mgb_log_warn("try to raise python exception for fork after cuda");
PyErr_SetString(PyExc_SystemError, "fork after cuda has been initialized");
}
#endif
class Init {
static Init inst;
Init() {
#if MGB_ENABLE_DEBUG_UTIL
mgb::debug::ForkAfterCudaError::throw_ = throw_fork_cuda_exc;
#endif
}
};
Init Init::inst;
int fork_exec_impl(const std::string &arg0, const std::string &arg1,
const std::string &arg2) {
auto pid = fork();
if (!pid) {
execl(arg0.c_str(), arg0.c_str(), arg1.c_str(), arg2.c_str(), nullptr);
fprintf(stderr, "[megbrain] failed to execl %s [%s, %s]: %s\n",
arg0.c_str(), arg1.c_str(), arg2.c_str(),
std::strerror(errno));
std::terminate();
}
mgb_assert(pid > 0, "failed to fork: %s", std::strerror(errno));
return pid;
}
} // anonymous namespace
// called from swig/misc.i
void _timed_func_set_fork_exec_path(const char *arg0, const char *arg1) {
using namespace std::placeholders;
mgb::sys::TimedFuncInvoker::ins().set_fork_exec_impl(
std::bind(fork_exec_impl, std::string{arg0}, std::string{arg1},
_1));
}
void _timed_func_exec_cb(const char *user_data) {
mgb::sys::TimedFuncInvoker::ins().fork_exec_impl_mainloop(user_data);
}
void _register_logger(PyObject *l) {
logger = l;
}
namespace {
void py_log_handler(mgb::LogLevel level,
const char *file, const char *func, int line, const char *fmt,
va_list ap) {
if (global_finalized()) {
return;
}
using mgb::LogLevel;
MGB_MARK_USED_VAR(file);
MGB_MARK_USED_VAR(func);
MGB_MARK_USED_VAR(line);
if (!logger)
return;
PYTHON_GIL;
const char *py_type;
switch (level) {
case LogLevel::DEBUG:
py_type = "debug";
break;
case LogLevel::INFO:
py_type = "info";
break;
case LogLevel::WARN:
py_type = "warning";
break;
case LogLevel::ERROR:
py_type = "error";
break;
default:
throw std::runtime_error("bad log level");
}
std::string msg = mgb::svsprintf(fmt, ap);
PyObject *py_msg = Py_BuildValue("s", msg.c_str());
PyObject_CallMethod(logger,
const_cast<char*>(py_type), const_cast<char*>("O"),
py_msg);
Py_DECREF(py_msg);
}
class LogHandlerSetter {
static LogHandlerSetter ins;
public:
LogHandlerSetter() {
mgb::set_log_handler(py_log_handler);
}
};
LogHandlerSetter LogHandlerSetter::ins;
} // anobymous namespace
// vim: syntax=cpp.doxygen foldmethod=marker foldmarker=f{{{,f}}}