1 files changed, 27 insertions, 5 deletions
diff --git a/realtime/rt/decoder.py b/realtime/rt/decoder.py
index aa6db64d..72b5b959 100644
--- a/realtime/rt/decoder.py
+++ b/realtime/rt/decoder.py
@@ -1,27 +1,37 @@
 import logging
 import os
 import subprocess
+import threading
 
 import util
 
 class Decoder:
 
-    def close(self):
+    def close(self, force=False):
+        if not force:
+            self.semaphore.acquire()
         self.decoder.stdin.close()
+        if not force:
+            self.semaphore.release()
 
     def decode(self, sentence, grammar=None):
+        '''Threadsafe'''
         input = '<seg grammar="{g}">{s}</seg>\n'.format(s=sentence, g=grammar) if grammar else '{}\n'.format(sentence)
+        self.semaphore.acquire()
         self.decoder.stdin.write(input)
-        return self.decoder.stdout.readline().strip()
+        hyp = self.decoder.stdout.readline().strip()
+        self.semaphore.release()
+        return hyp
 
 class CdecDecoder(Decoder):
-    
+
     def __init__(self, config, weights):
         cdec_root = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
         decoder = os.path.join(cdec_root, 'decoder', 'cdec')
         decoder_cmd = [decoder, '-c', config, '-w', weights]
         logging.info('Executing: {}'.format(' '.join(decoder_cmd)))
         self.decoder = util.popen_io(decoder_cmd)
+        self.semaphore = threading.Semaphore()
 
 class MIRADecoder(Decoder):
 
@@ -32,15 +42,27 @@ class MIRADecoder(Decoder):
         mira_cmd = [mira, '-c', config, '-w', weights, '-o', '2', '-C', '0.001', '-b', '500', '-k', '500', '-u', '-t']
         logging.info('Executing: {}'.format(' '.join(mira_cmd)))
         self.decoder = util.popen_io(mira_cmd)
+        self.semaphore = threading.Semaphore()
 
     def get_weights(self):
+        '''Threadsafe'''
+        self.semaphore.acquire()
         self.decoder.stdin.write('WEIGHTS ||| WRITE\n')
-        return self.decoder.stdout.readline().strip()
+        weights = self.decoder.stdout.readline().strip()
+        self.semaphore.release()
+        return weights
 
     def set_weights(self, w_line):
+        '''Threadsafe'''
+        self.semaphore.acquire()
         self.decoder.stdin.write('WEIGHTS ||| {}\n'.format(w_line))
+        self.semaphore.release()
 
     def update(self, sentence, grammar, reference):
+        '''Threadsafe'''
         input = 'LEARN ||| <seg grammar="{g}">{s}</seg> ||| {r}\n'.format(s=sentence, g=grammar, r=reference)
+        self.semaphore.acquire()
         self.decoder.stdin.write(input)
-        return self.decoder.stdout.readline().strip()
+        log = self.decoder.stdout.readline().strip()
+        self.semaphore.release()
+        return log