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/*
** Copyright 2011, 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 "egl_tls.h"
#include <stdlib.h>
#include <android-base/properties.h>
#include <log/log.h>
#include "CallStack.h"
#include "egl_platform_entries.h"
namespace android {
pthread_key_t egl_tls_t::sKey = TLS_KEY_NOT_INITIALIZED;
pthread_once_t egl_tls_t::sOnceKey = PTHREAD_ONCE_INIT;
egl_tls_t::egl_tls_t()
: error(EGL_SUCCESS), ctx(nullptr), logCallWithNoContext(true) {
}
const char *egl_tls_t::egl_strerror(EGLint err) {
switch (err) {
case EGL_SUCCESS: return "EGL_SUCCESS";
case EGL_NOT_INITIALIZED: return "EGL_NOT_INITIALIZED";
case EGL_BAD_ACCESS: return "EGL_BAD_ACCESS";
case EGL_BAD_ALLOC: return "EGL_BAD_ALLOC";
case EGL_BAD_ATTRIBUTE: return "EGL_BAD_ATTRIBUTE";
case EGL_BAD_CONFIG: return "EGL_BAD_CONFIG";
case EGL_BAD_CONTEXT: return "EGL_BAD_CONTEXT";
case EGL_BAD_CURRENT_SURFACE: return "EGL_BAD_CURRENT_SURFACE";
case EGL_BAD_DISPLAY: return "EGL_BAD_DISPLAY";
case EGL_BAD_MATCH: return "EGL_BAD_MATCH";
case EGL_BAD_NATIVE_PIXMAP: return "EGL_BAD_NATIVE_PIXMAP";
case EGL_BAD_NATIVE_WINDOW: return "EGL_BAD_NATIVE_WINDOW";
case EGL_BAD_PARAMETER: return "EGL_BAD_PARAMETER";
case EGL_BAD_SURFACE: return "EGL_BAD_SURFACE";
case EGL_CONTEXT_LOST: return "EGL_CONTEXT_LOST";
default: return "UNKNOWN";
}
}
void egl_tls_t::validateTLSKey()
{
struct TlsKeyInitializer {
static void create() { pthread_key_create(&sKey, destructTLSData); }
};
pthread_once(&sOnceKey, TlsKeyInitializer::create);
}
void egl_tls_t::destructTLSData(void* data) {
egl_tls_t* tls = static_cast<egl_tls_t*>(data);
if (!tls) return;
// Several things in the call tree of eglReleaseThread expect to be able to get the current
// thread state directly from TLS. That's a problem because Bionic has already cleared our
// TLS pointer before calling this function (pthread_getspecific(sKey) will return nullptr).
// Instead the data is passed as our parameter.
//
// Ideally we'd refactor this so we have thin wrappers that retrieve thread state from TLS and
// then pass it as a parameter (or 'this' pointer) to functions that do the real work without
// touching TLS. Then from here we could just call those implementation functions with the the
// TLS data we just received as a parameter.
//
// But that's a fairly invasive refactoring, so to do this robustly in the short term we just
// put the data *back* in TLS and call the top-level eglReleaseThread. It and it's call tree
// will retrieve the value from TLS, and then finally clear the TLS data. Bionic explicitly
// tolerates re-setting the value that it's currently trying to destruct (see
// pthread_key_clean_all()). Even if we forgot to clear the restored TLS data, bionic would
// call the destructor again, but eventually gives up and just leaks the data rather than
// enter an infinite loop.
pthread_setspecific(sKey, tls);
eglReleaseThread();
ALOGE_IF(pthread_getspecific(sKey) != nullptr,
"EGL TLS data still exists after eglReleaseThread");
}
void egl_tls_t::setErrorEtcImpl(
const char* caller, int line, EGLint error, bool quiet) {
validateTLSKey();
egl_tls_t* tls = getTLS();
if (tls->error != error) {
if (!quiet) {
ALOGE("%s:%d error %x (%s)",
caller, line, error, egl_strerror(error));
if (base::GetBoolProperty("debug.egl.callstack", false)) {
CallStack::log(LOG_TAG);
}
}
tls->error = error;
}
}
bool egl_tls_t::logNoContextCall() {
egl_tls_t* tls = getTLS();
if (tls->logCallWithNoContext) {
tls->logCallWithNoContext = false;
return true;
}
return false;
}
egl_tls_t* egl_tls_t::getTLS() {
egl_tls_t* tls = (egl_tls_t*)pthread_getspecific(sKey);
if (tls == nullptr) {
tls = new egl_tls_t;
pthread_setspecific(sKey, tls);
}
return tls;
}
void egl_tls_t::clearTLS() {
if (sKey != TLS_KEY_NOT_INITIALIZED) {
egl_tls_t* tls = (egl_tls_t*)pthread_getspecific(sKey);
if (tls) {
pthread_setspecific(sKey, nullptr);
delete tls;
}
}
}
void egl_tls_t::clearError() {
// This must clear the error from all the underlying EGL implementations as
// well as the EGL wrapper layer.
android::eglGetErrorImpl();
}
EGLint egl_tls_t::getError() {
if (sKey == TLS_KEY_NOT_INITIALIZED) {
return EGL_SUCCESS;
}
egl_tls_t* tls = (egl_tls_t*)pthread_getspecific(sKey);
if (!tls) {
return EGL_SUCCESS;
}
EGLint error = tls->error;
tls->error = EGL_SUCCESS;
return error;
}
void egl_tls_t::setContext(EGLContext ctx) {
validateTLSKey();
getTLS()->ctx = ctx;
}
EGLContext egl_tls_t::getContext() {
if (sKey == TLS_KEY_NOT_INITIALIZED) {
return EGL_NO_CONTEXT;
}
egl_tls_t* tls = (egl_tls_t *)pthread_getspecific(sKey);
if (!tls) return EGL_NO_CONTEXT;
return tls->ctx;
}
} // namespace android
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