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bpo-41710: Add private _PyDeadline_Get() function (GH-28674)

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Add a private C API for deadlines: add _PyDeadline_Init() and
_PyDeadline_Get() functions.

* Add _PyTime_Add() and _PyTime_Mul() functions which compute t1+t2
  and t1*t2 and clamp the result on overflow.
* _PyTime_MulDiv() now uses _PyTime_Add() and _PyTime_Mul().
This commit is contained in:
Victor Stinner 2021-10-01 13:29:25 +02:00 • committed by GitHub
parent 54957f16a6
commit 833fdf126c
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GPG key ID: 4AEE18F83AFDEB23
11 changed files with 177 additions and 109 deletions
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20
Modules/signalmodule.c
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@ -1221,11 +1221,7 @@ signal_sigtimedwait_impl(PyObject *module, sigset_t sigset,
PyObject *timeout_obj)
/*[clinic end generated code: output=59c8971e8ae18a64 input=87fd39237cf0b7ba]*/
{
struct timespec ts;
siginfo_t si;
int res;
_PyTime_t timeout, deadline, monotonic;
_PyTime_t timeout;
if (_PyTime_FromSecondsObject(&timeout,
timeout_obj, _PyTime_ROUND_CEILING) < 0)
return NULL;
@ -1235,12 +1231,16 @@ signal_sigtimedwait_impl(PyObject *module, sigset_t sigset,
return NULL;
}
deadline = _PyTime_GetMonotonicClock() + timeout;
_PyTime_t deadline = _PyDeadline_Init(timeout);
siginfo_t si;
do {
if (_PyTime_AsTimespec(timeout, &ts) < 0)
struct timespec ts;
if (_PyTime_AsTimespec(timeout, &ts) < 0) {
return NULL;
}
int res;
Py_BEGIN_ALLOW_THREADS
res = sigtimedwait(&sigset, &si, &ts);
Py_END_ALLOW_THREADS
@ -1259,10 +1259,10 @@ signal_sigtimedwait_impl(PyObject *module, sigset_t sigset,
if (PyErr_CheckSignals())
return NULL;
monotonic = _PyTime_GetMonotonicClock();
timeout = deadline - monotonic;
if (timeout < 0)
timeout = _PyDeadline_Get(deadline);
if (timeout < 0) {
break;
}
} while (1);
return fill_siginfo(&si);