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expr_parser: fix concurrent use issues

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Change-Id: Ic9ef5d42f4348ada5c418a36118660e79a1a689b
Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>
This commit is contained in:
Andrew Boie 2016-06-02 12:22:41 -07:00 • committed by Anas Nashif
commit 99c0f64b34
1 changed files with 10 additions and 2 deletions
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12
scripts/expr_parser.py
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@ -17,6 +17,7 @@
import sys import sys
import os import os
import copy import copy
import threading
try: try:
import ply.lex as lex import ply.lex as lex
@ -204,14 +205,21 @@ def ast_expr(ast, env):
elif ast[0] == "exists": elif ast[0] == "exists":
return True if ast_sym(ast[1], env) else False return True if ast_sym(ast[1], env) else False
mutex = threading.Lock()
def parse(expr_text, env): def parse(expr_text, env):
"""Given a text representation of an expression in our language, """Given a text representation of an expression in our language,
use the provided environment to determine whether the expression use the provided environment to determine whether the expression
is true or false""" is true or false"""
ast = parser.parse(expr_text)
return ast_expr(ast, env)
# Like it's C counterpart, state machine is not thread-safe
mutex.acquire()
try:
ast = parser.parse(expr_text)
finally:
mutex.release()
return ast_expr(ast, env)
# Just some test code # Just some test code
if __name__ == "__main__": if __name__ == "__main__":