/* * Copyright (c) 2017 Cisco and/or its affiliates. * 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. */ #ifndef included_clib_lock_h #define included_clib_lock_h #include <vppinfra/clib.h> typedef struct { CLIB_CACHE_LINE_ALIGN_MARK (cacheline0); u32 lock; #if CLIB_DEBUG > 0 pid_t pid; uword thread_index; void *frame_address; #endif } *clib_spinlock_t; static inline void clib_spinlock_init (clib_spinlock_t * p) { *p = clib_mem_alloc_aligned (CLIB_CACHE_LINE_BYTES, CLIB_CACHE_LINE_BYTES); memset ((void *) *p, 0, CLIB_CACHE_LINE_BYTES); } static inline void clib_spinlock_free (clib_spinlock_t * p) { if (*p) { clib_mem_free ((void *) *p); *p = 0; } } static_always_inline void clib_spinlock_lock (clib_spinlock_t * p) { while (__sync_lock_test_and_set (&(*p)->lock, 1)) #if __x86_64__ __builtin_ia32_pause () #endif ; #if CLIB_DEBUG > 0 (*p)->frame_address = __builtin_frame_address (0); (*p)->pid = getpid (); (*p)->thread_index = os_get_thread_index (); #endif } static_always_inline void clib_spinlock_lock_if_init (clib_spinlock_t * p) { if (PREDICT_FALSE (*p != 0)) clib_spinlock_lock (p); } static_always_inline void clib_spinlock_unlock (clib_spinlock_t * p) { #if CLIB_DEBUG > 0 (*p)->frame_address = 0; (*p)->pid = 0; (*p)->thread_index = 0; #endif /* Make sure all writes are complete before releasing the lock */ CLIB_MEMORY_BARRIER (); (*p)->lock = 0; } static_always_inline void clib_spinlock_unlock_if_init (clib_spinlock_t * p) { if (PREDICT_FALSE (*p != 0)) clib_spinlock_unlock (p); } #endif /* * fd.io coding-style-patch-verification: ON * * Local Variables: * eval: (c-set-style "gnu") * End: */