#!coding=utf-8import os ,tracebackimport time'''fork()系統(tǒng)調(diào)用是Unix下以自身進(jìn)程創(chuàng)建子進(jìn)程的系統(tǒng)調(diào)用，一次調(diào)用，兩次返回，如果返回是0，則是子進(jìn)程，如果返回值>0，則是父進(jìn)程（返回值是子進(jìn)程的pid）'''source = 10i = 0try:  print '***********************'  pid = os.fork()  #這里會(huì)返回兩次，所以下面的省略號(hào)會(huì)輸出2次  print '......'  if pid == 0:#子進(jìn)程    print "this is child process"    source = source - 1    print 'child process source is ',source    time.sleep(10)    print 'child sleep done'  else:  #父進(jìn)程    print "this is parent process"    print 'parent process source is ',source    time.sleep(10)    print 'parent sleep done'  print sourceexcept:  traceback.print_exc()

***********************......this is child processchild process source is 9......this is parent processparent process source is 10child sleep done9parent sleep done10