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// Copyright 2017 The Go Authors. All rights reserved. // Use of this source code is governed by a BSD-style // license that can be found in the LICENSE file. package runtime import ( "runtime/internal/atomic" ) // This is a copy of sync/rwmutex.go rewritten to work in the runtime. // A rwmutex is a reader/writer mutual exclusion lock. // The lock can be held by an arbitrary number of readers or a single writer. // This is a variant of sync.RWMutex, for the runtime package. // Like mutex, rwmutex blocks the calling M. // It does not interact with the goroutine scheduler. type rwmutex struct { rLock mutex // protects readers, readerPass, writer readers muintptr // list of pending readers readerPass uint32 // number of pending readers to skip readers list wLock mutex // serializes writers writer muintptr // pending writer waiting for completing readers readerCount atomic.Int32 // number of pending readers readerWait atomic.Int32 // number of departing readers readRank lockRank // semantic lock rank for read locking } // Lock ranking an rwmutex has two aspects: // // Semantic ranking: this rwmutex represents some higher level lock that // protects some resource (e.g., allocmLock protects creation of new Ms). The // read and write locks of that resource need to be represented in the lock // rank. // // Internal ranking: as an implementation detail, rwmutex uses two mutexes: // rLock and wLock. These have lock order requirements: wLock must be locked // before rLock. This also needs to be represented in the lock rank. // // Semantic ranking is represented by acquiring readRank during read lock and // writeRank during write lock. // // wLock is held for the duration of a write lock, so it uses writeRank // directly, both for semantic and internal ranking. rLock is only held // temporarily inside the rlock/lock methods, so it uses readRankInternal to // represent internal ranking. Semantic ranking is represented by a separate // acquire of readRank for the duration of a read lock. // // The lock ranking must document this ordering: // - readRankInternal is a leaf lock. // - readRank is taken before readRankInternal. // - writeRank is taken before readRankInternal. // - readRank is placed in the lock order wherever a read lock of this rwmutex // belongs. // - writeRank is placed in the lock order wherever a write lock of this // rwmutex belongs. func (rw *rwmutex) init(readRank, readRankInternal, writeRank lockRank) { rw.readRank = readRank lockInit(&rw.rLock, readRankInternal) lockInit(&rw.wLock, writeRank) } const rwmutexMaxReaders = 1 << 30 // rlock locks rw for reading. func (rw *rwmutex) rlock() { // The reader must not be allowed to lose its P or else other // things blocking on the lock may consume all of the Ps and // deadlock (issue #20903). Alternatively, we could drop the P // while sleeping. acquirem() acquireLockRank(rw.readRank) lockWithRankMayAcquire(&rw.rLock, getLockRank(&rw.rLock)) if rw.readerCount.Add(1) < 0 { // A writer is pending. Park on the reader queue. systemstack(func() { lock(&rw.rLock) if rw.readerPass > 0 { // Writer finished. rw.readerPass -= 1 unlock(&rw.rLock) } else { // Queue this reader to be woken by // the writer. m := getg().m m.schedlink = rw.readers rw.readers.set(m) unlock(&rw.rLock) notesleep(&m.park) noteclear(&m.park) } }) } } // runlock undoes a single rlock call on rw. func (rw *rwmutex) runlock() { if r := rw.readerCount.Add(-1); r < 0 { if r+1 == 0 || r+1 == -rwmutexMaxReaders { throw("runlock of unlocked rwmutex") } // A writer is pending. if rw.readerWait.Add(-1) == 0 { // The last reader unblocks the writer. lock(&rw.rLock) w := rw.writer.ptr() if w != nil { notewakeup(&w.park) } unlock(&rw.rLock) } } releaseLockRank(rw.readRank) releasem(getg().m) } // lock locks rw for writing. func (rw *rwmutex) lock() { // Resolve competition with other writers and stick to our P. lock(&rw.wLock) m := getg().m // Announce that there is a pending writer. r := rw.readerCount.Add(-rwmutexMaxReaders) + rwmutexMaxReaders // Wait for any active readers to complete. lock(&rw.rLock) if r != 0 && rw.readerWait.Add(r) != 0 { // Wait for reader to wake us up. systemstack(func() { rw.writer.set(m) unlock(&rw.rLock) notesleep(&m.park) noteclear(&m.park) }) } else { unlock(&rw.rLock) } } // unlock unlocks rw for writing. func (rw *rwmutex) unlock() { // Announce to readers that there is no active writer. r := rw.readerCount.Add(rwmutexMaxReaders) if r >= rwmutexMaxReaders { throw("unlock of unlocked rwmutex") } // Unblock blocked readers. lock(&rw.rLock) for rw.readers.ptr() != nil { reader := rw.readers.ptr() rw.readers = reader.schedlink reader.schedlink.set(nil) notewakeup(&reader.park) r -= 1 } // If r > 0, there are pending readers that aren't on the // queue. Tell them to skip waiting. rw.readerPass += uint32(r) unlock(&rw.rLock) // Allow other writers to proceed. unlock(&rw.wLock) }