diff options
Diffstat (limited to 'django/utils/synch.py')
| -rw-r--r-- | django/utils/synch.py | 15 |
1 files changed, 7 insertions, 8 deletions
diff --git a/django/utils/synch.py b/django/utils/synch.py index 6fcd81390e..2e808c1e01 100644 --- a/django/utils/synch.py +++ b/django/utils/synch.py @@ -1,6 +1,6 @@ """ Synchronization primitives: - + - reader-writer lock (preference to writers) (Contributed to Django by eugene@lazutkin.com) @@ -14,17 +14,16 @@ except ImportError: class RWLock: """ Classic implementation of reader-writer lock with preference to writers. - + Readers can access a resource simultaneously. Writers get an exclusive access. - + API is self-descriptive: reader_enters() reader_leaves() writer_enters() writer_leaves() """ - def __init__(self): self.mutex = threading.RLock() self.can_read = threading.Semaphore(0) @@ -33,7 +32,7 @@ class RWLock: self.active_writers = 0 self.waiting_readers = 0 self.waiting_writers = 0 - + def reader_enters(self): self.mutex.acquire() try: @@ -45,7 +44,7 @@ class RWLock: finally: self.mutex.release() self.can_read.acquire() - + def reader_leaves(self): self.mutex.acquire() try: @@ -56,7 +55,7 @@ class RWLock: self.can_write.release() finally: self.mutex.release() - + def writer_enters(self): self.mutex.acquire() try: @@ -68,7 +67,7 @@ class RWLock: finally: self.mutex.release() self.can_write.acquire() - + def writer_leaves(self): self.mutex.acquire() try: |