From d9b19be1d9c1baa5e8b92c1960c14e435e6b532f Mon Sep 17 00:00:00 2001
From: Yuri Kunde Schlesner <yuriks@yuriks.net>
Date: Sun, 11 Jan 2015 13:53:11 -0200
Subject: Kernel: Convert Semaphore to not use Handles

---
 src/core/hle/kernel/semaphore.cpp | 65 +++++++++++++--------------------------
 1 file changed, 22 insertions(+), 43 deletions(-)

(limited to 'src/core/hle/kernel/semaphore.cpp')

diff --git a/src/core/hle/kernel/semaphore.cpp b/src/core/hle/kernel/semaphore.cpp
index 135d8fb2a..a9e406ef4 100644
--- a/src/core/hle/kernel/semaphore.cpp
+++ b/src/core/hle/kernel/semaphore.cpp
@@ -2,8 +2,6 @@
 // Licensed under GPLv2 or any later version
 // Refer to the license.txt file included.
 
-#include <queue>
-
 #include "common/common.h"
 
 #include "core/hle/kernel/kernel.h"
@@ -12,69 +10,50 @@
 
 namespace Kernel {
 
-class Semaphore : public WaitObject {
-public:
-    std::string GetTypeName() const override { return "Semaphore"; }
-    std::string GetName() const override { return name; }
-
-    static const HandleType HANDLE_TYPE = HandleType::Semaphore;
-    HandleType GetHandleType() const override { return HANDLE_TYPE; }
-
-    s32 max_count;                              ///< Maximum number of simultaneous holders the semaphore can have
-    s32 available_count;                        ///< Number of free slots left in the semaphore
-    std::string name;                           ///< Name of semaphore (optional)
-
-    bool ShouldWait() override {
-        return available_count <= 0;
-    }
-
-    void Acquire() override {
-        _assert_msg_(Kernel, !ShouldWait(), "object unavailable!");
-        --available_count;
-    }
-};
-
-////////////////////////////////////////////////////////////////////////////////////////////////////
-
-ResultCode CreateSemaphore(Handle* handle, s32 initial_count, 
-    s32 max_count, const std::string& name) {
+ResultVal<SharedPtr<Semaphore>> Semaphore::Create(s32 initial_count, s32 max_count,
+        std::string name) {
 
     if (initial_count > max_count)
         return ResultCode(ErrorDescription::InvalidCombination, ErrorModule::Kernel,
                           ErrorSummary::WrongArgument, ErrorLevel::Permanent);
 
-    Semaphore* semaphore = new Semaphore;
-    // TOOD(yuriks): Fix error reporting
-    *handle = g_handle_table.Create(semaphore).ValueOr(INVALID_HANDLE);
+    SharedPtr<Semaphore> semaphore(new Semaphore);
+    // TOOD(yuriks): Don't create Handle (see Thread::Create())
+    CASCADE_RESULT(auto unused, Kernel::g_handle_table.Create(semaphore));
 
     // When the semaphore is created, some slots are reserved for other threads,
     // and the rest is reserved for the caller thread
     semaphore->max_count = max_count;
     semaphore->available_count = initial_count;
-    semaphore->name = name;
+    semaphore->name = std::move(name);
 
-    return RESULT_SUCCESS;
+    return MakeResult<SharedPtr<Semaphore>>(std::move(semaphore));
 }
 
-ResultCode ReleaseSemaphore(s32* count, Handle handle, s32 release_count) {
-    Semaphore* semaphore = g_handle_table.Get<Semaphore>(handle).get();
-    if (semaphore == nullptr)
-        return InvalidHandle(ErrorModule::Kernel);
+bool Semaphore::ShouldWait() {
+    return available_count <= 0;
+}
+
+void Semaphore::Acquire() {
+    _assert_msg_(Kernel, !ShouldWait(), "object unavailable!");
+    --available_count;
+}
 
-    if (semaphore->max_count - semaphore->available_count < release_count)
+ResultVal<s32> Semaphore::Release(s32 release_count) {
+    if (max_count - available_count < release_count)
         return ResultCode(ErrorDescription::OutOfRange, ErrorModule::Kernel, 
                           ErrorSummary::InvalidArgument, ErrorLevel::Permanent);
 
-    *count = semaphore->available_count;
-    semaphore->available_count += release_count;
+    s32 previous_count = available_count;
+    available_count += release_count;
 
     // Notify some of the threads that the semaphore has been released
     // stop once the semaphore is full again or there are no more waiting threads
-    while (!semaphore->ShouldWait() && semaphore->WakeupNextThread() != nullptr) {
-        semaphore->Acquire();
+    while (!ShouldWait() && WakeupNextThread() != nullptr) {
+        Acquire();
     }
 
-    return RESULT_SUCCESS;
+    return MakeResult<s32>(previous_count);
 }
 
 } // namespace
-- 
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