patch from St�phane Bidoul for setting up threads global defaults. this

* build_glob.py global.data globals.c parser.c
  include/libxml/globals.h: patch from St�phane Bidoul for setting
  up threads global defaults.
* doc/libxml2-api.xml: this extends the API with new functions
* python/tests/Makefile.am python/tests/reader2.py
  python/tests/thread2.py: integrated the associated testcase and
  fixed the error string used in reader2
Daniel

python/tests/thread2.py

@@ -0,0 +1,96 @@
+#!/usr/bin/python -u
+import string, sys, time
+import thread
+from threading import Thread, Lock
+
+import libxml2
+
+THREADS_COUNT = 15
+
+failed = 0
+
+class ErrorHandler:
+
+    def __init__(self):
+        self.errors = []
+        self.lock = Lock()
+
+    def handler(self,ctx,str):
+        self.lock.acquire()
+        self.errors.append(str)
+        self.lock.release()
+
+def getLineNumbersDefault():
+    old = libxml2.lineNumbersDefault(0)
+    libxml2.lineNumbersDefault(old)
+    return old
+
+def test(expectedLineNumbersDefault):
+    time.sleep(1)
+    global failed
+    # check a per thread-global
+    if expectedLineNumbersDefault != getLineNumbersDefault():
+        failed = 1
+        print "FAILED to obtain correct value for " \
+              "lineNumbersDefault in thread %d" % thread.get_ident()
+    # check ther global error handler 
+    # (which is NOT per-thread in the python bindings)
+    try:
+        doc = libxml2.parseFile("bad.xml")
+    except:
+        pass
+    else:
+        assert "failed"
+
+# global error handler
+eh = ErrorHandler()
+libxml2.registerErrorHandler(eh.handler,"")
+
+# set on the main thread only
+libxml2.lineNumbersDefault(1) 
+test(1)
+ec = len(eh.errors)
+if ec == 0:
+    print "FAILED: should have obtained errors"
+    sys.exit(1)
+
+ts = []
+for i in range(THREADS_COUNT):
+    # expect 0 for lineNumbersDefault because
+    # the new value has been set on the main thread only
+    ts.append(Thread(target=test,args=(0,)))
+for t in ts:
+    t.start()
+for t in ts:
+    t.join()
+
+if len(eh.errors) != ec+THREADS_COUNT*ec:
+    print "FAILED: did not obtain the correct number of errors"
+    sys.exit(1)
+
+# set lineNumbersDefault for future new threads
+libxml2.thrDefLineNumbersDefaultValue(1)
+ts = []
+for i in range(THREADS_COUNT):
+    # expect 1 for lineNumbersDefault
+    ts.append(Thread(target=test,args=(1,)))
+for t in ts:
+    t.start()
+for t in ts:
+    t.join()
+
+if len(eh.errors) != ec+THREADS_COUNT*ec*2:
+    print "FAILED: did not obtain the correct number of errors"
+    sys.exit(1)
+
+if failed:
+    print "FAILED"
+    sys.exit(1)
+
+# Memory debug specific
+libxml2.cleanupParser()
+if libxml2.debugMemory(1) == 0:
+    print "OK"
+else:
+    print "Memory leak %d bytes" % (libxml2.debugMemory(1))
+    libxml2.dumpMemory()