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/*
* Copyright (C) 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 "thread.h"
namespace art {
void Thread::SetNativePriority(int) {
// Do nothing.
}
int Thread::GetNativePriority() {
return kNormThreadPriority;
}
static void SigAltStack(stack_t* new_stack, stack_t* old_stack) {
if (sigaltstack(new_stack, old_stack) == -1) {
PLOG(FATAL) << "sigaltstack failed";
}
}
void Thread::SetUpAlternateSignalStack() {
// Create and set an alternate signal stack.
stack_t ss;
ss.ss_sp = new uint8_t[SIGSTKSZ];
ss.ss_size = SIGSTKSZ;
ss.ss_flags = 0;
CHECK(ss.ss_sp != NULL);
SigAltStack(&ss, NULL);
// Double-check that it worked.
ss.ss_sp = NULL;
SigAltStack(NULL, &ss);
VLOG(threads) << "Alternate signal stack is " << PrettySize(ss.ss_size) << " at " << ss.ss_sp;
}
void Thread::TearDownAlternateSignalStack() {
// Get the pointer so we can free the memory.
stack_t ss;
SigAltStack(NULL, &ss);
uint8_t* allocated_signal_stack = reinterpret_cast<uint8_t*>(ss.ss_sp);
// Tell the kernel to stop using it.
ss.ss_sp = NULL;
ss.ss_flags = SS_DISABLE;
ss.ss_size = SIGSTKSZ; // Avoid ENOMEM failure with Mac OS' buggy libc.
SigAltStack(&ss, NULL);
// Free it.
delete[] allocated_signal_stack;
}
} // namespace art
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