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src/common/thread.cpp

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+// Copyright 2013 Dolphin Emulator Project / 2014 Citra Emulator Project
+// Licensed under GPLv2 or any later version
+// Refer to the license.txt file included.
+
+#include "common/common_funcs.h"
+#include "common/logging/log.h"
+#include "common/thread.h"
+#ifdef __APPLE__
+#include <mach/mach.h>
+#elif defined(_WIN32)
+#include <windows.h>
+#else
+#if defined(__Bitrig__) || defined(__DragonFly__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+#include <pthread_np.h>
+#else
+#include <pthread.h>
+#endif
+#include <sched.h>
+#endif
+#ifndef _WIN32
+#include <unistd.h>
+#endif
+
+#include <string>
+
+#ifdef __FreeBSD__
+#define cpu_set_t cpuset_t
+#endif
+
+namespace Common {
+
+#ifdef _WIN32
+
+void SetCurrentThreadPriority(ThreadPriority new_priority) {
+    auto handle = GetCurrentThread();
+    int windows_priority = 0;
+    switch (new_priority) {
+    case ThreadPriority::Low:
+        windows_priority = THREAD_PRIORITY_BELOW_NORMAL;
+        break;
+    case ThreadPriority::Normal:
+        windows_priority = THREAD_PRIORITY_NORMAL;
+        break;
+    case ThreadPriority::High:
+        windows_priority = THREAD_PRIORITY_ABOVE_NORMAL;
+        break;
+    case ThreadPriority::VeryHigh:
+        windows_priority = THREAD_PRIORITY_HIGHEST;
+        break;
+    default:
+        windows_priority = THREAD_PRIORITY_NORMAL;
+        break;
+    }
+    SetThreadPriority(handle, windows_priority);
+}
+
+#else
+
+void SetCurrentThreadPriority(ThreadPriority new_priority) {
+    pthread_t this_thread = pthread_self();
+
+    s32 max_prio = sched_get_priority_max(SCHED_OTHER);
+    s32 min_prio = sched_get_priority_min(SCHED_OTHER);
+    u32 level = static_cast<u32>(new_priority) + 1;
+
+    struct sched_param params;
+    if (max_prio > min_prio) {
+        params.sched_priority = min_prio + ((max_prio - min_prio) * level) / 4;
+    } else {
+        params.sched_priority = min_prio - ((min_prio - max_prio) * level) / 4;
+    }
+
+    pthread_setschedparam(this_thread, SCHED_OTHER, &params);
+}
+
+#endif
+
+#ifdef _MSC_VER
+
+// Sets the debugger-visible name of the current thread.
+// Uses trick documented in:
+// https://docs.microsoft.com/en-us/visualstudio/debugger/how-to-set-a-thread-name-in-native-code
+void SetCurrentThreadName(const char* name) {
+    static const DWORD MS_VC_EXCEPTION = 0x406D1388;
+
+#pragma pack(push, 8)
+    struct THREADNAME_INFO {
+        DWORD dwType;     // must be 0x1000
+        LPCSTR szName;    // pointer to name (in user addr space)
+        DWORD dwThreadID; // thread ID (-1=caller thread)
+        DWORD dwFlags;    // reserved for future use, must be zero
+    } info;
+#pragma pack(pop)
+
+    info.dwType = 0x1000;
+    info.szName = name;
+    info.dwThreadID = std::numeric_limits<DWORD>::max();
+    info.dwFlags = 0;
+
+    __try {
+        RaiseException(MS_VC_EXCEPTION, 0, sizeof(info) / sizeof(ULONG_PTR), (ULONG_PTR*)&info);
+    } __except (EXCEPTION_CONTINUE_EXECUTION) {
+    }
+}
+
+#else // !MSVC_VER, so must be POSIX threads
+
+// MinGW with the POSIX threading model does not support pthread_setname_np
+#if !defined(_WIN32) || defined(_MSC_VER)
+void SetCurrentThreadName(const char* name) {
+#ifdef __APPLE__
+    pthread_setname_np(name);
+#elif defined(__Bitrig__) || defined(__DragonFly__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+    pthread_set_name_np(pthread_self(), name);
+#elif defined(__NetBSD__)
+    pthread_setname_np(pthread_self(), "%s", (void*)name);
+#elif defined(__linux__)
+    // Linux limits thread names to 15 characters and will outright reject any
+    // attempt to set a longer name with ERANGE.
+    std::string truncated(name, std::min(strlen(name), static_cast<size_t>(15)));
+    if (int e = pthread_setname_np(pthread_self(), truncated.c_str())) {
+        errno = e;
+        LOG_ERROR(Common, "Failed to set thread name to '{}': {}", truncated, GetLastErrorMsg());
+    }
+#else
+    pthread_setname_np(pthread_self(), name);
+#endif
+}
+#endif
+
+#if defined(_WIN32)
+void SetCurrentThreadName(const char* name) {
+    // Do Nothing on MingW
+}
+#endif
+
+#endif
+
+} // namespace Common