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#! /bin/sh -e
# DP: Backport new function signal.set_wakeup_fd from the trunk
dir=
if [ $# -eq 3 -a "$2" = '-d' ]; then
pdir="-d $3"
dir="$3/"
elif [ $# -ne 1 ]; then
echo >&2 "usage: `basename $0`: -patch|-unpatch [-d <srcdir>]"
exit 1
fi
case "$1" in
-patch)
patch $pdir -f --no-backup-if-mismatch -p0 < $0
#cd ${dir}gcc && autoconf
;;
-unpatch)
patch $pdir -f --no-backup-if-mismatch -R -p0 < $0
#rm ${dir}gcc/configure
;;
*)
echo >&2 "usage: `basename $0`: -patch|-unpatch [-d <srcdir>]"
exit 1
esac
exit 0
Index: Include/pyerrors.h
===================================================================
--- Include/pyerrors.h (revision 60376)
+++ Include/pyerrors.h (working copy)
@@ -239,6 +239,9 @@
PyAPI_FUNC(int) PyErr_CheckSignals(void);
PyAPI_FUNC(void) PyErr_SetInterrupt(void);
+/* In signalmodule.c */
+int PySignal_SetWakeupFd(int fd);
+
/* Support for adding program text to SyntaxErrors */
PyAPI_FUNC(void) PyErr_SyntaxLocation(const char *, int);
PyAPI_FUNC(PyObject *) PyErr_ProgramText(const char *, int);
Index: Lib/test/test_signal.py
===================================================================
--- Lib/test/test_signal.py (revision 60376)
+++ Lib/test/test_signal.py (working copy)
@@ -165,3 +165,60 @@
signal.signal(signal.SIGUSR1, usr1)
signal.signal(signal.SIGUSR2, usr2)
signal.signal(signal.SIGALRM, alrm)
+
+class WakeupSignalTests(unittest.TestCase):
+ TIMEOUT_FULL = 10
+ TIMEOUT_HALF = 5
+
+ def test_wakeup_fd_early(self):
+ import select
+
+ signal.alarm(1)
+ before_time = time.time()
+ # We attempt to get a signal during the sleep,
+ # before select is called
+ time.sleep(self.TIMEOUT_FULL)
+ mid_time = time.time()
+ self.assert_(mid_time - before_time < self.TIMEOUT_HALF)
+ select.select([self.read], [], [], self.TIMEOUT_FULL)
+ after_time = time.time()
+ self.assert_(after_time - mid_time < self.TIMEOUT_HALF)
+
+ def test_wakeup_fd_during(self):
+ import select
+
+ signal.alarm(1)
+ before_time = time.time()
+ # We attempt to get a signal during the select call
+ self.assertRaises(select.error, select.select,
+ [self.read], [], [], self.TIMEOUT_FULL)
+ after_time = time.time()
+ self.assert_(after_time - before_time < self.TIMEOUT_HALF)
+
+ def setUp(self):
+ import fcntl
+
+ self.alrm = signal.signal(signal.SIGALRM, lambda x,y:None)
+ self.read, self.write = os.pipe()
+ flags = fcntl.fcntl(self.write, fcntl.F_GETFL, 0)
+ flags = flags | os.O_NONBLOCK
+ fcntl.fcntl(self.write, fcntl.F_SETFL, flags)
+ self.old_wakeup = signal.set_wakeup_fd(self.write)
+
+ def tearDown(self):
+ signal.set_wakeup_fd(self.old_wakeup)
+ os.close(self.read)
+ os.close(self.write)
+ signal.signal(signal.SIGALRM, self.alrm)
+
+
+def test_main():
+ if sys.platform[:3] in ('win', 'os2') or sys.platform == 'riscos':
+ raise test_support.TestSkipped("Can't test signal on %s" % \
+ sys.platform)
+
+ test_support.run_unittest(WakeupSignalTests)
+
+
+if __name__ == "__main__":
+ test_main()
Index: Modules/signalmodule.c
===================================================================
--- Modules/signalmodule.c (revision 60376)
+++ Modules/signalmodule.c (working copy)
@@ -12,6 +12,8 @@
#include <signal.h>
+#include <sys/stat.h>
+
#ifndef SIG_ERR
#define SIG_ERR ((PyOS_sighandler_t)(-1))
#endif
@@ -77,7 +77,10 @@
PyObject *func;
} Handlers[NSIG];
-static int is_tripped = 0; /* Speed up sigcheck() when none tripped */
+static sig_atomic_t wakeup_fd = -1;
+
+/* Speed up sigcheck() when none tripped */
+static volatile is_tripped = 0;
static PyObject *DefaultHandler;
static PyObject *IgnoreHandler;
@@ -128,6 +132,8 @@
cleared in PyErr_CheckSignals() before .tripped. */
is_tripped = 1;
Py_AddPendingCall(checksignals_witharg, NULL);
+ if (wakeup_fd != -1)
+ write(wakeup_fd, "\0", 1);
#ifdef WITH_THREAD
}
#endif
@@ -267,6 +273,50 @@
anything else -- the callable Python object used as a handler");
+static PyObject *
+signal_set_wakeup_fd(PyObject *self, PyObject *args)
+{
+ struct stat buf;
+ int fd, old_fd;
+ if (!PyArg_ParseTuple(args, "i:set_wakeup_fd", &fd))
+ return NULL;
+#ifdef WITH_THREAD
+ if (PyThread_get_thread_ident() != main_thread) {
+ PyErr_SetString(PyExc_ValueError,
+ "set_wakeup_fd only works in main thread");
+ return NULL;
+ }
+#endif
+ if (fd != -1 && fstat(fd, &buf) != 0) {
+ PyErr_SetString(PyExc_ValueError, "invalid fd");
+ return NULL;
+ }
+ old_fd = wakeup_fd;
+ wakeup_fd = fd;
+ return PyLong_FromLong(old_fd);
+}
+
+PyDoc_STRVAR(set_wakeup_fd_doc,
+"set_wakeup_fd(fd) -> fd\n\
+\n\
+Sets the fd to be written to (with '\\0') when a signal\n\
+comes in. A library can use this to wakeup select or poll.\n\
+The previous fd is returned.\n\
+\n\
+The fd must be non-blocking.");
+
+/* C API for the same, without all the error checking */
+int
+PySignal_SetWakeupFd(int fd)
+{
+ int old_fd = wakeup_fd;
+ if (fd < 0)
+ fd = -1;
+ wakeup_fd = fd;
+ return old_fd;
+}
+
+
/* List of functions defined in the module */
static PyMethodDef signal_methods[] = {
#ifdef HAVE_ALARM
@@ -274,11 +324,12 @@
#endif
{"signal", signal_signal, METH_VARARGS, signal_doc},
{"getsignal", signal_getsignal, METH_VARARGS, getsignal_doc},
+ {"set_wakeup_fd", signal_set_wakeup_fd, METH_VARARGS, set_wakeup_fd_doc},
#ifdef HAVE_PAUSE
{"pause", (PyCFunction)signal_pause,
METH_NOARGS,pause_doc},
#endif
- {"default_int_handler", signal_default_int_handler,
+ {"default_int_handler", signal_default_int_handler,
METH_VARARGS, default_int_handler_doc},
{NULL, NULL} /* sentinel */
};
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