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@ -64,11 +64,11 @@ func initNSLock(isDist bool) { |
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isDist: isDist, |
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lockMap: make(map[nsParam]*nsLock), |
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} |
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if globalDebugLock { |
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// lock Debugging enabed, initialize nsLockMap with entry for debugging information.
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// entries of <volume,path> -> stateInfo of locks, for instrumentation purpose.
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// Initialize nsLockMap with entry for instrumentation
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// information.
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// Entries of <volume,path> -> stateInfo of locks
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nsMutex.debugLockMap = make(map[nsParam]*debugLockInfoPerVolumePath) |
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} |
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} |
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func (n *nsLockMap) initLockInfoForVolumePath(param nsParam) { |
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@ -131,14 +131,13 @@ func (n *nsLockMap) lock(volume, path string, lockOrigin, opsID string, readLock |
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} |
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nsLk.ref++ // Update ref count here to avoid multiple races.
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if globalDebugLock { |
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// Change the state of the lock to be blocked for the given pair of <volume, path>
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// and <OperationID> till the lock unblocks. The lock for accessing `nsMutex` is
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// held inside the function itself.
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// Change the state of the lock to be blocked for the given
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// pair of <volume, path> and <OperationID> till the lock
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// unblocks. The lock for accessing `nsMutex` is held inside
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// the function itself.
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if err := n.statusNoneToBlocked(param, lockOrigin, opsID, readLock); err != nil { |
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errorIf(err, "Failed to set lock state to blocked.") |
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} |
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} |
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// Unlock map before Locking NS which might block.
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n.lockMapMutex.Unlock() |
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@ -150,20 +149,19 @@ func (n *nsLockMap) lock(volume, path string, lockOrigin, opsID string, readLock |
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nsLk.Lock() |
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} |
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// Check if lock debugging enabled.
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if globalDebugLock { |
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// Changing the status of the operation from blocked to running.
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// change the state of the lock to be running (from blocked) for
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// the given pair of <volume, path> and <OperationID>.
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// Changing the status of the operation from blocked to
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// running. change the state of the lock to be running (from
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// blocked) for the given pair of <volume, path> and
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// <OperationID>.
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if err := n.statusBlockedToRunning(param, lockOrigin, opsID, readLock); err != nil { |
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errorIf(err, "Failed to set the lock state to running.") |
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} |
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} |
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} |
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// Unlock the namespace resource.
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func (n *nsLockMap) unlock(volume, path, opsID string, readLock bool) { |
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// nsLk.Unlock() will not block, hence locking the map for the entire function is fine.
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// nsLk.Unlock() will not block, hence locking the map for the
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// entire function is fine.
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n.lockMapMutex.Lock() |
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defer n.lockMapMutex.Unlock() |
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@ -175,48 +173,51 @@ func (n *nsLockMap) unlock(volume, path, opsID string, readLock bool) { |
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nsLk.Unlock() |
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} |
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if nsLk.ref == 0 { |
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errorIf(errors.New("Namespace reference count cannot be 0."), "Invalid reference count detected.") |
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errorIf(errors.New("Namespace reference count cannot be 0."), |
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"Invalid reference count detected.") |
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} |
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if nsLk.ref != 0 { |
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nsLk.ref-- |
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// Locking debug enabled, delete the lock state entry for given operation ID.
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if globalDebugLock { |
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// delete the lock state entry for given operation ID.
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err := n.deleteLockInfoEntryForOps(param, opsID) |
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if err != nil { |
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errorIf(err, "Failed to delete lock info entry.") |
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} |
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} |
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} |
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if nsLk.ref == 0 { |
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// Remove from the map if there are no more references.
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delete(n.lockMap, param) |
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// Locking debug enabled, delete the lock state entry for given <volume, path> pair.
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if globalDebugLock { |
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// delete the lock state entry for given
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// <volume, path> pair.
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err := n.deleteLockInfoEntryForVolumePath(param) |
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if err != nil { |
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errorIf(err, "Failed to delete lock info entry.") |
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} |
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} |
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} |
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} |
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} |
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// Lock - locks the given resource for writes, using a previously
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// allocated name space lock or initializing a new one.
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func (n *nsLockMap) Lock(volume, path, opsID string) { |
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var lockOrigin string |
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// Lock debugging enabled. The caller information of the lock held has
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// been obtained here before calling any other function.
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if globalDebugLock { |
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// Fetching the package, function name and the line number of the caller from the runtime.
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// here is an example https://play.golang.org/p/perrmNRI9_ .
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// The caller information of the lock held has been obtained
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// here before calling any other function.
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// Fetching the package, function name and the line number of
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// the caller from the runtime. here is an example
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// https://play.golang.org/p/perrmNRI9_ .
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pc, fn, line, success := runtime.Caller(1) |
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if !success { |
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errorIf(errors.New("Couldn't get caller info."), "Fetching caller info form runtime failed.") |
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} |
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lockOrigin = fmt.Sprintf("[lock held] in %s[%s:%d]", runtime.FuncForPC(pc).Name(), fn, line) |
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errorIf(errors.New("Couldn't get caller info."), |
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"Fetching caller info form runtime failed.") |
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} |
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lockOrigin = fmt.Sprintf("[lock held] in %s[%s:%d]", |
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runtime.FuncForPC(pc).Name(), fn, line) |
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readLock := false |
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n.lock(volume, path, lockOrigin, opsID, readLock) |
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} |
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@ -231,17 +232,21 @@ func (n *nsLockMap) Unlock(volume, path, opsID string) { |
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func (n *nsLockMap) RLock(volume, path, opsID string) { |
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var lockOrigin string |
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readLock := true |
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// Lock debugging enabled. The caller information of the lock held has
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// been obtained here before calling any other function.
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if globalDebugLock { |
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// Fetching the package, function name and the line number of the
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// caller from the runtime. Here is an example https://play.golang.org/p/perrmNRI9_ .
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// The caller information of the lock held has been obtained
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// here before calling any other function.
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// Fetching the package, function name and the line number of
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// the caller from the runtime. Here is an example
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// https://play.golang.org/p/perrmNRI9_ .
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pc, fn, line, success := runtime.Caller(1) |
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if !success { |
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errorIf(errors.New("Couldn't get caller info."), "Fetching caller info form runtime failed.") |
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} |
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lockOrigin = fmt.Sprintf("[lock held] in %s[%s:%d]", runtime.FuncForPC(pc).Name(), fn, line) |
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errorIf(errors.New("Couldn't get caller info."), |
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"Fetching caller info form runtime failed.") |
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} |
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lockOrigin = fmt.Sprintf("[lock held] in %s[%s:%d]", |
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runtime.FuncForPC(pc).Name(), fn, line) |
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n.lock(volume, path, lockOrigin, opsID, readLock) |
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} |
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