cython.parallel: Use restore exception utility code when code.error_label is used

--HG--
extra : transplant_source : %27mb%12_V%3D%F4%A3%B2%03%DC%1Ew%F1%23%B8P%A4Q

Cython/Compiler/Nodes.py

@@ -6404,6 +6404,7 @@ class ParallelStatNode(StatNode, ParallelNode):
             code.put_goto(code.return_label)
 
             if self.error_label_used:
+                code.globalstate.use_utility_code(restore_exception_utility_code)
                 code.putln("    case 4:")
                 self.restore_parallel_exception(code)
                 code.put_goto(code.error_label)
@@ -6485,7 +6486,7 @@ class ParallelRangeNode(ParallelStatNode):
 
     is_prange = True
 
-    nogil = False
+    nogil = None
     schedule = None
     num_threads = None
 
@@ -6522,6 +6523,10 @@ class ParallelRangeNode(ParallelStatNode):
                                                         (self.schedule,))
 
     def analyse_expressions(self, env):
+        if self.nogil:
+            was_nogil = env.nogil
+            env.nogil = True
+
         if self.target is None:
             error(self.pos, "prange() can only be used as part of a for loop")
             return
@@ -6573,6 +6578,9 @@ class ParallelRangeNode(ParallelStatNode):
 
         super(ParallelRangeNode, self).analyse_expressions(env)
 
+        if self.nogil:
+            env.nogil = was_nogil
+
     def nogil_check(self, env):
         names = 'start', 'stop', 'step', 'target'
         nodes = self.start, self.stop, self.step, self.target

tests/errors/e_cython_parallel_nogil_env.pyx

+# mode: error
+
+from cython.parallel import *
+def psum(int n):
+   cdef double sum
+   cdef int i
+   cdef double x,step,t1,t2
+   sum=0
+   step=1.0/n
+   for i in prange(n,nogil=True):
+       x = (i)*step
+       sum+=4.0/(1.0+x*x)
+   return sum*step
+
+_ERRORS = u"""
+e_cython_parallel_nogil_env.pyx:12:15: Pythonic division not allowed without gil, consider using cython.cdivision(True)
+"""

tests/run/sequential_parallel.pyx

@@ -705,3 +705,18 @@ def outer_parallel_section():
     for i in prange(10, nogil=True):
         sum += inner_parallel_section()
     return sum
+
+cdef int nogil_cdef_except_clause() nogil except 0:
+    return 1
+
+cdef void nogil_cdef_except_star() nogil except *:
+    pass
+
+def test_nogil_cdef_except_clause():
+    """
+    >>> test_nogil_cdef_except_clause()
+    """
+    cdef int i
+    for i in prange(10, nogil=True):
+        nogil_cdef_except_clause()
+        nogil_cdef_except_star()