spinlock_akaros.inc (1359B)
1 // Copyright 2017 The Abseil Authors. 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // https://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 // 15 // This file is an Akaros-specific part of spinlock_wait.cc 16 17 #include <atomic> 18 19 #include "absl/base/internal/scheduling_mode.h" 20 21 extern "C" { 22 23 ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)( 24 std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */, 25 int /* loop */, absl::base_internal::SchedulingMode /* mode */) { 26 // In Akaros, one must take care not to call anything that could cause a 27 // malloc(), a blocking system call, or a uthread_yield() while holding a 28 // spinlock. Our callers assume will not call into libraries or other 29 // arbitrary code. 30 } 31 32 ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)( 33 std::atomic<uint32_t>* /* lock_word */, bool /* all */) {} 34 35 } // extern "C"