a6dc4412ba
A new locking mechanism: read/write locks When there is a writer it is not possible to put on a read lock or a write lock; when there is a reader it is possible to reenter the read lock but not the write lock. Writers are exclusive locks, readers are shared locks. At the same time through the waiter count to determine whether there is currently a blocked task, if there is then in the unlock time to wake up all the waiter, through the priority of the competition to complete the blocked lock execution. For example: When we have a reader blocking two waiter writers, when the reader is unlocked it wakes up both writers. The writer with higher priority wakes up and checks for a successful condition and locks the lock, the second writer wakes up and fails to check for a condition and continues to block the lock. Signed-off-by: chenrun1 <chenrun1@xiaomi.com>
39 lines
1.4 KiB
Plaintext
39 lines
1.4 KiB
Plaintext
############################################################################
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# sched/semaphore/Make.defs
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more
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# contributor license agreements. See the NOTICE file distributed with
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# this work for additional information regarding copyright ownership. The
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# ASF licenses this file to you under the Apache License, Version 2.0 (the
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# "License"); you may not use this file except in compliance with the
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# License. You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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#
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############################################################################
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# Add semaphore-related files to the build
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CSRCS += sem_destroy.c sem_wait.c sem_trywait.c sem_tickwait.c
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CSRCS += sem_timedwait.c sem_clockwait.c sem_timeout.c sem_post.c
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CSRCS += sem_recover.c sem_reset.c sem_waitirq.c sem_rw.c
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ifeq ($(CONFIG_PRIORITY_INHERITANCE),y)
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CSRCS += sem_initialize.c sem_holder.c sem_setprotocol.c
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endif
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ifeq ($(CONFIG_SPINLOCK),y)
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CSRCS += spinlock.c
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endif
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# Include semaphore build support
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DEPPATH += --dep-path semaphore
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VPATH += :semaphore
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