From d19f10d43aa400e1183aa21a97099d02074131a2 Mon Sep 17 00:00:00 2001
From: Jason Sams <jsams@google.com>
Date: Fri, 22 May 2009 14:03:28 -0700
Subject: Add the Renderscript library. (Not in the build by default yet.)

This library can be used to create animated 3D User Interfaces.

This library is currently under heavy development, so it's not part of
the build by default.

In order to build this library, you must define

   BUILD_RENDERSCRIPT=true

in your build environment.

You will also have to manually edit

 build/core/prelink-linux-arm.map

And add libRS and libRS_jni at the end like this (exact address may change.)

libRS.so                0x9A100000
libRS_jni.so            0x9A000000
---
 libs/rs/rsLocklessFifo.cpp | 180 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 180 insertions(+)
 create mode 100644 libs/rs/rsLocklessFifo.cpp

(limited to 'libs/rs/rsLocklessFifo.cpp')

diff --git a/libs/rs/rsLocklessFifo.cpp b/libs/rs/rsLocklessFifo.cpp
new file mode 100644
index 000000000000..3f51e04c2c16
--- /dev/null
+++ b/libs/rs/rsLocklessFifo.cpp
@@ -0,0 +1,180 @@
+/*
+ * Copyright (C) 2009 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "rsLocklessFifo.h"
+
+using namespace android;
+
+#include <utils/Log.h>
+
+LocklessCommandFifo::LocklessCommandFifo()
+{
+}
+
+LocklessCommandFifo::~LocklessCommandFifo()
+{
+}
+
+bool LocklessCommandFifo::init(uint32_t sizeInBytes)
+{
+    // Add room for a buffer reset command
+    mBuffer = static_cast<uint8_t *>(malloc(sizeInBytes + 4));
+    if (!mBuffer) {
+        LOGE("LocklessFifo allocation failure");
+        return false;
+    }
+
+    int status = pthread_mutex_init(&mMutex, NULL);
+    if (status) {
+        LOGE("LocklessFifo mutex init failure");
+        free(mBuffer);
+        return false;
+    }
+    status = pthread_cond_init(&mCondition, NULL);
+    if (status) {
+        LOGE("LocklessFifo condition init failure");
+        pthread_mutex_destroy(&mMutex);
+        free(mBuffer);
+        return false;
+    }
+
+    mSize = sizeInBytes;
+    mPut = mBuffer;
+    mGet = mBuffer;
+    mEnd = mBuffer + (sizeInBytes) - 1;
+    dumpState("init");
+    return true;
+}
+
+uint32_t LocklessCommandFifo::getFreeSpace() const 
+{
+    int32_t freeSpace = 0;
+    //dumpState("getFreeSpace");
+
+    if (mPut >= mGet) {
+        freeSpace = mEnd - mPut;
+    } else {
+        freeSpace = mGet - mPut;
+    }
+
+    if (freeSpace < 0) {
+        freeSpace = 0;
+    }
+    
+    return freeSpace;
+}
+
+bool LocklessCommandFifo::isEmpty() const
+{
+    return mPut == mGet;
+}
+
+
+void * LocklessCommandFifo::reserve(uint32_t sizeInBytes)
+{
+    // Add space for command header;
+    sizeInBytes += 4;
+
+    //dumpState("reserve");
+    if (getFreeSpace() < sizeInBytes) {
+        makeSpace(sizeInBytes);
+    }
+
+    return mPut + 4;
+}
+
+void LocklessCommandFifo::commit(uint32_t command, uint32_t sizeInBytes)
+{
+    //LOGE("commit cmd %i  size %i", command, sizeInBytes);
+    //dumpState("commit 1");
+    reinterpret_cast<uint16_t *>(mPut)[0] = command;
+    reinterpret_cast<uint16_t *>(mPut)[1] = sizeInBytes;
+    mPut += ((sizeInBytes + 3) & ~3) + 4;
+    //dumpState("commit 2");
+
+}
+
+void LocklessCommandFifo::commitSync(uint32_t command, uint32_t sizeInBytes)
+{
+    commit(command, sizeInBytes);
+    flush();
+}
+
+void LocklessCommandFifo::flush()
+{
+    //dumpState("flush 1");
+    while(mPut != mGet) {
+        usleep(1);
+    }
+    //dumpState("flush 2");
+}
+
+const void * LocklessCommandFifo::get(uint32_t *command, uint32_t *bytesData)
+{
+    while(1) {
+        while(isEmpty()) {
+            usleep(10);
+        }
+        //dumpState("get 3");
+
+        *command = reinterpret_cast<const uint16_t *>(mGet)[0];
+        *bytesData = reinterpret_cast<const uint16_t *>(mGet)[1];
+        //LOGE("Got %i, %i", *command, *bytesData);
+    
+        if (*command) {
+            // non-zero command is valid
+            return mGet+4;
+        }
+    
+        // zero command means reset to beginning.
+        mGet = mBuffer;
+    }
+}
+
+void LocklessCommandFifo::next()
+{
+    uint32_t bytes = reinterpret_cast<const uint16_t *>(mGet)[1];
+    mGet += ((bytes + 3) & ~3) + 4;
+    //dumpState("next");
+}
+
+void LocklessCommandFifo::makeSpace(uint32_t bytes)
+{
+    if ((mPut+bytes) > mEnd) {
+        // Need to loop regardless of where get is.
+        while((mGet > mPut) && (mPut+4 >= mGet)) {
+            sleep(1);
+        }
+
+        // Toss in a reset then the normal wait for space will do the rest.
+        reinterpret_cast<uint16_t *>(mPut)[0] = 0;
+        reinterpret_cast<uint16_t *>(mPut)[1] = 0;
+        mPut += 4;
+    }
+
+    // it will fit here so we just need to wait for space.
+    while(getFreeSpace() < bytes) {
+        sleep(1);
+    }
+    
+}
+
+void LocklessCommandFifo::dumpState(const char *s) const
+{
+    LOGE("%s  put %p, get %p,  buf %p,  end %p", s, mPut, mGet, mBuffer, mEnd);
+}
+
+
-- 
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