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- /* Copyright (C) 2014 Stony Brook University
- This file is part of Graphene Library OS.
- Graphene Library OS is free software: you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public License
- as published by the Free Software Foundation, either version 3 of the
- License, or (at your option) any later version.
- Graphene Library OS is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU Lesser General Public License for more details.
- You should have received a copy of the GNU Lesser General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>. */
- /*
- * shim_sleep.c
- *
- * Implementation of system call "pause" and "nanosleep".
- */
- #include <shim_internal.h>
- #include <shim_utils.h>
- #include <shim_table.h>
- #include <shim_handle.h>
- #include <shim_vma.h>
- #include <shim_thread.h>
- #include <pal.h>
- #include <pal_error.h>
- #include <errno.h>
- static bool signal_pending (void)
- {
- struct shim_thread* cur = get_cur_thread();
- if (!cur)
- return false;
- lock(&cur->lock);
- if (!cur->signal_logs || !cur->has_signal.counter) {
- unlock(&cur->lock);
- return false;
- }
- for (int sig = 1; sig <= NUM_SIGS; sig++) {
- if (atomic_read(&cur->signal_logs[sig - 1].head) !=
- atomic_read(&cur->signal_logs[sig - 1].tail)) {
- /* at least one signal of type sig... */
- if (!__sigismember(&cur->signal_mask, sig)) {
- /* ...and this type is not blocked */
- unlock(&cur->lock);
- return true;
- }
- }
- }
- unlock(&cur->lock);
- return false;
- }
- int shim_do_pause (void)
- {
- if (signal_pending())
- return -EINTR;
- /* ~0ULL micro sec ~= 805675 years */
- DkThreadDelayExecution(~((PAL_NUM)0));
- return -EINTR;
- }
- int shim_do_nanosleep (const struct __kernel_timespec * rqtp,
- struct __kernel_timespec * rmtp)
- {
- if (!rqtp)
- return -EFAULT;
- if (signal_pending()) {
- if (rmtp) {
- /* no time elapsed, so copy time interval from rqtp to rmtp */
- rmtp->tv_sec = rqtp->tv_sec;
- rmtp->tv_nsec = rqtp->tv_nsec;
- }
- return -EINTR;
- }
- unsigned long time = rqtp->tv_sec * 1000000L + rqtp->tv_nsec / 1000;
- unsigned long ret = DkThreadDelayExecution(time);
- if (ret < time) {
- if (rmtp) {
- unsigned long remtime = time - ret;
- rmtp->tv_sec = remtime / 1000000L;
- rmtp->tv_nsec = (remtime - rmtp->tv_sec * 1000) * 1000;
- }
- return -EINTR;
- }
- return 0;
- }
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