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#pragma once
//simple thread library
//primary rationale is that std::thread does not support custom stack sizes
//this is highly critical in certain applications such as threaded web servers
//an added bonus is that it avoids licensing issues on Windows
//win32-pthreads (needed for std::thread) is licensed under the GPL only
#include <nall/platform.hpp>
#include <nall/function.hpp>
#include <nall/intrinsics.hpp>
namespace nall {
using mutex = std::mutex;
using recursive_mutex = std::recursive_mutex;
template<typename T> using lock_guard = std::lock_guard<T>;
template<typename T> using atomic = std::atomic<T>;
}
#if defined(API_POSIX)
#include <pthread.h>
namespace nall {
struct thread {
thread(const thread&) = delete;
auto operator=(const thread&) -> thread& = delete;
thread() = default;
thread(thread&&) = default;
auto operator=(thread&&) -> thread& = default;
auto join() -> void;
static auto create(const function<void (uintptr)>& callback, uintptr parameter = 0, u32 stacksize = 0) -> thread;
static auto detach() -> void;
static auto exit() -> void;
struct context {
function<auto (uintptr) -> void> callback;
uintptr parameter = 0;
};
private:
pthread_t handle = (pthread_t)nullptr;
};
inline auto _threadCallback(void* parameter) -> void* {
auto context = (thread::context*)parameter;
context->callback(context->parameter);
delete context;
return nullptr;
}
inline auto thread::join() -> void {
pthread_join(handle, nullptr);
}
inline auto thread::create(const function<void (uintptr)>& callback, uintptr parameter, u32 stacksize) -> thread {
thread instance;
auto context = new thread::context;
context->callback = callback;
context->parameter = parameter;
pthread_attr_t attr;
pthread_attr_init(&attr);
if(stacksize) pthread_attr_setstacksize(&attr, max(PTHREAD_STACK_MIN, stacksize));
pthread_create(&instance.handle, &attr, _threadCallback, (void*)context);
return instance;
}
inline auto thread::detach() -> void {
pthread_detach(pthread_self());
}
inline auto thread::exit() -> void {
pthread_exit(nullptr);
}
}
#elif defined(API_WINDOWS)
namespace nall {
struct thread {
thread(const thread&) = delete;
auto operator=(const thread&) -> thread& = delete;
thread() = default;
thread(thread&& source) { operator=(move(source)); }
~thread() { close(); }
auto operator=(thread&& source) -> thread& {
close();
handle = source.handle;
source.handle = 0;
return *this;
}
auto close() -> void;
auto join() -> void;
static auto create(const function<void (uintptr)>& callback, uintptr parameter = 0, u32 stacksize = 0) -> thread;
static auto detach() -> void;
static auto exit() -> void;
struct context {
function<auto (uintptr) -> void> callback;
uintptr parameter = 0;
};
private:
HANDLE handle = 0;
};
inline auto WINAPI _threadCallback(void* parameter) -> DWORD {
auto context = (thread::context*)parameter;
context->callback(context->parameter);
delete context;
return 0;
}
inline auto thread::close() -> void {
if(handle) {
CloseHandle(handle);
handle = 0;
}
}
inline auto thread::join() -> void {
if(handle) {
//wait until the thread has finished executing ...
WaitForSingleObject(handle, INFINITE);
CloseHandle(handle);
handle = 0;
}
}
inline auto thread::create(const function<void (uintptr)>& callback, uintptr parameter, u32 stacksize) -> thread {
thread instance;
auto context = new thread::context;
context->callback = callback;
context->parameter = parameter;
instance.handle = CreateThread(nullptr, stacksize, _threadCallback, (void*)context, 0, nullptr);
return instance;
}
inline auto thread::detach() -> void {
//Windows threads do not use this concept:
//~thread() frees resources via CloseHandle()
//thread continues to run even after handle is closed
}
inline auto thread::exit() -> void {
ExitThread(0);
}
}
#endif
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