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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#ifndef BaseProfilerUtils_h
+#define BaseProfilerUtils_h
+
+// This header contains most process- and thread-related functions.
+// It is safe to include unconditionally.
+
+// --------------------------------------------- WASI process & thread ids
+#if defined(__wasi__)
+
+namespace mozilla::baseprofiler::detail {
+using ProcessIdType = unsigned;
+using ThreadIdType = unsigned;
+} // namespace mozilla::baseprofiler::detail
+
+// --------------------------------------------- Windows process & thread ids
+#elif defined(XP_WIN)
+
+namespace mozilla::baseprofiler::detail {
+using ProcessIdType = int;
+using ThreadIdType = unsigned long;
+} // namespace mozilla::baseprofiler::detail
+
+// --------------------------------------------- Non-Windows process id
+#else
+// All non-Windows platforms are assumed to be POSIX, which has getpid().
+
+# include <unistd.h>
+namespace mozilla::baseprofiler::detail {
+using ProcessIdType = decltype(getpid());
+} // namespace mozilla::baseprofiler::detail
+
+// --------------------------------------------- Non-Windows thread id
+// ------------------------------------------------------- macOS
+# if defined(XP_MACOSX)
+
+namespace mozilla::baseprofiler::detail {
+using ThreadIdType = uint64_t;
+} // namespace mozilla::baseprofiler::detail
+
+// ------------------------------------------------------- Android
+// Test Android before Linux, because Linux includes Android.
+# elif defined(__ANDROID__) || defined(ANDROID)
+
+# include <sys/types.h>
+namespace mozilla::baseprofiler::detail {
+using ThreadIdType = decltype(gettid());
+} // namespace mozilla::baseprofiler::detail
+
+// ------------------------------------------------------- Linux
+# elif defined(XP_LINUX)
+
+namespace mozilla::baseprofiler::detail {
+using ThreadIdType = long;
+} // namespace mozilla::baseprofiler::detail
+
+// ------------------------------------------------------- FreeBSD
+# elif defined(XP_FREEBSD)
+
+namespace mozilla::baseprofiler::detail {
+using ThreadIdType = long;
+} // namespace mozilla::baseprofiler::detail
+
+// ------------------------------------------------------- Others
+# else
+
+# include <thread>
+
+namespace mozilla::baseprofiler::detail {
+using ThreadIdType = std::thread::id;
+} // namespace mozilla::baseprofiler::detail
+
+# endif
+#endif // End of non-XP_WIN.
+
+#include <stdint.h>
+#include <string.h>
+#include <type_traits>
+
+namespace mozilla::baseprofiler {
+
+// Trivially-copyable class containing a process id. It may be left unspecified.
+class BaseProfilerProcessId {
+ public:
+ using NativeType = detail::ProcessIdType;
+
+ using NumberType =
+ std::conditional_t<(sizeof(NativeType) <= 4), uint32_t, uint64_t>;
+ static_assert(sizeof(NativeType) <= sizeof(NumberType));
+
+ // Unspecified process id.
+ constexpr BaseProfilerProcessId() = default;
+
+ [[nodiscard]] constexpr bool IsSpecified() const {
+ return mProcessId != scUnspecified;
+ }
+
+ // Construct from a native type.
+ [[nodiscard]] static BaseProfilerProcessId FromNativeId(
+ const NativeType& aNativeProcessId) {
+ BaseProfilerProcessId id;
+ // Convert trivially-copyable native id by copying its bits.
+ static_assert(std::is_trivially_copyable_v<NativeType>);
+ memcpy(&id.mProcessId, &aNativeProcessId, sizeof(NativeType));
+ return id;
+ }
+
+ // Get the process id as a number, which may be unspecified.
+ // This should only be used for serialization or logging.
+ [[nodiscard]] constexpr NumberType ToNumber() const { return mProcessId; }
+
+ // BaseProfilerProcessId from given number (which may be unspecified).
+ constexpr static BaseProfilerProcessId FromNumber(
+ const NumberType& aProcessId) {
+ BaseProfilerProcessId id;
+ id.mProcessId = aProcessId;
+ return id;
+ }
+
+ [[nodiscard]] constexpr bool operator==(
+ const BaseProfilerProcessId& aOther) const {
+ return mProcessId == aOther.mProcessId;
+ }
+ [[nodiscard]] constexpr bool operator!=(
+ const BaseProfilerProcessId& aOther) const {
+ return mProcessId != aOther.mProcessId;
+ }
+
+ private:
+ static constexpr NumberType scUnspecified = 0;
+ NumberType mProcessId = scUnspecified;
+};
+
+// Check traits. These should satisfy usage in std::atomic.
+static_assert(std::is_trivially_copyable_v<BaseProfilerProcessId>);
+static_assert(std::is_copy_constructible_v<BaseProfilerProcessId>);
+static_assert(std::is_move_constructible_v<BaseProfilerProcessId>);
+static_assert(std::is_copy_assignable_v<BaseProfilerProcessId>);
+static_assert(std::is_move_assignable_v<BaseProfilerProcessId>);
+
+// Trivially-copyable class containing a thread id. It may be left unspecified.
+class BaseProfilerThreadId {
+ public:
+ using NativeType = detail::ThreadIdType;
+
+ using NumberType =
+ std::conditional_t<(sizeof(NativeType) <= 4), uint32_t, uint64_t>;
+ static_assert(sizeof(NativeType) <= sizeof(NumberType));
+
+ // Unspecified thread id.
+ constexpr BaseProfilerThreadId() = default;
+
+ [[nodiscard]] constexpr bool IsSpecified() const {
+ return mThreadId != scUnspecified;
+ }
+
+ // Construct from a native type.
+ [[nodiscard]] static BaseProfilerThreadId FromNativeId(
+ const NativeType& aNativeThreadId) {
+ BaseProfilerThreadId id;
+ // Convert trivially-copyable native id by copying its bits.
+ static_assert(std::is_trivially_copyable_v<NativeType>);
+ memcpy(&id.mThreadId, &aNativeThreadId, sizeof(NativeType));
+ return id;
+ }
+
+ // Get the thread id as a number, which may be unspecified.
+ // This should only be used for serialization or logging.
+ [[nodiscard]] constexpr NumberType ToNumber() const { return mThreadId; }
+
+ // BaseProfilerThreadId from given number (which may be unspecified).
+ constexpr static BaseProfilerThreadId FromNumber(
+ const NumberType& aThreadId) {
+ BaseProfilerThreadId id;
+ id.mThreadId = aThreadId;
+ return id;
+ }
+
+ [[nodiscard]] constexpr bool operator==(
+ const BaseProfilerThreadId& aOther) const {
+ return mThreadId == aOther.mThreadId;
+ }
+ [[nodiscard]] constexpr bool operator!=(
+ const BaseProfilerThreadId& aOther) const {
+ return mThreadId != aOther.mThreadId;
+ }
+
+ private:
+ static constexpr NumberType scUnspecified = 0;
+ NumberType mThreadId = scUnspecified;
+};
+
+// Check traits. These should satisfy usage in std::atomic.
+static_assert(std::is_trivially_copyable_v<BaseProfilerThreadId>);
+static_assert(std::is_copy_constructible_v<BaseProfilerThreadId>);
+static_assert(std::is_move_constructible_v<BaseProfilerThreadId>);
+static_assert(std::is_copy_assignable_v<BaseProfilerThreadId>);
+static_assert(std::is_move_assignable_v<BaseProfilerThreadId>);
+
+} // namespace mozilla::baseprofiler
+
+#include "mozilla/Types.h"
+
+namespace mozilla::baseprofiler {
+
+// Get the current process's ID.
+[[nodiscard]] MFBT_API BaseProfilerProcessId profiler_current_process_id();
+
+// Get the current thread's ID.
+[[nodiscard]] MFBT_API BaseProfilerThreadId profiler_current_thread_id();
+
+// Must be called at least once from the main thread, before any other main-
+// thread id function.
+MFBT_API void profiler_init_main_thread_id();
+
+[[nodiscard]] MFBT_API BaseProfilerThreadId profiler_main_thread_id();
+
+[[nodiscard]] MFBT_API bool profiler_is_main_thread();
+
+} // namespace mozilla::baseprofiler
+
+#endif // BaseProfilerUtils_h