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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/um/os-Linux/time.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | arch/um/os-Linux/time.c | 115 |
1 files changed, 115 insertions, 0 deletions
diff --git a/arch/um/os-Linux/time.c b/arch/um/os-Linux/time.c new file mode 100644 index 000000000..4d5591d96 --- /dev/null +++ b/arch/um/os-Linux/time.c @@ -0,0 +1,115 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2015 Anton Ivanov (aivanov@{brocade.com,kot-begemot.co.uk}) + * Copyright (C) 2015 Thomas Meyer (thomas@m3y3r.de) + * Copyright (C) 2012-2014 Cisco Systems + * Copyright (C) 2000 - 2007 Jeff Dike (jdike{addtoit,linux.intel}.com) + */ + +#include <stddef.h> +#include <unistd.h> +#include <errno.h> +#include <signal.h> +#include <time.h> +#include <sys/time.h> +#include <kern_util.h> +#include <os.h> +#include <string.h> + +static timer_t event_high_res_timer = 0; + +static inline long long timespec_to_ns(const struct timespec *ts) +{ + return ((long long) ts->tv_sec * UM_NSEC_PER_SEC) + ts->tv_nsec; +} + +long long os_persistent_clock_emulation(void) +{ + struct timespec realtime_tp; + + clock_gettime(CLOCK_REALTIME, &realtime_tp); + return timespec_to_ns(&realtime_tp); +} + +/** + * os_timer_create() - create an new posix (interval) timer + */ +int os_timer_create(void) +{ + timer_t *t = &event_high_res_timer; + + if (timer_create(CLOCK_MONOTONIC, NULL, t) == -1) + return -1; + + return 0; +} + +int os_timer_set_interval(unsigned long long nsecs) +{ + struct itimerspec its; + + its.it_value.tv_sec = nsecs / UM_NSEC_PER_SEC; + its.it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC; + + its.it_interval.tv_sec = nsecs / UM_NSEC_PER_SEC; + its.it_interval.tv_nsec = nsecs % UM_NSEC_PER_SEC; + + if (timer_settime(event_high_res_timer, 0, &its, NULL) == -1) + return -errno; + + return 0; +} + +int os_timer_one_shot(unsigned long long nsecs) +{ + struct itimerspec its = { + .it_value.tv_sec = nsecs / UM_NSEC_PER_SEC, + .it_value.tv_nsec = nsecs % UM_NSEC_PER_SEC, + + .it_interval.tv_sec = 0, + .it_interval.tv_nsec = 0, // we cheat here + }; + + timer_settime(event_high_res_timer, 0, &its, NULL); + return 0; +} + +/** + * os_timer_disable() - disable the posix (interval) timer + */ +void os_timer_disable(void) +{ + struct itimerspec its; + + memset(&its, 0, sizeof(struct itimerspec)); + timer_settime(event_high_res_timer, 0, &its, NULL); +} + +long long os_nsecs(void) +{ + struct timespec ts; + + clock_gettime(CLOCK_MONOTONIC,&ts); + return timespec_to_ns(&ts); +} + +/** + * os_idle_sleep() - sleep until interrupted + */ +void os_idle_sleep(void) +{ + struct itimerspec its; + sigset_t set, old; + + /* block SIGALRM while we analyze the timer state */ + sigemptyset(&set); + sigaddset(&set, SIGALRM); + sigprocmask(SIG_BLOCK, &set, &old); + + /* check the timer, and if it'll fire then wait for it */ + timer_gettime(event_high_res_timer, &its); + if (its.it_value.tv_sec || its.it_value.tv_nsec) + sigsuspend(&old); + /* either way, restore the signal mask */ + sigprocmask(SIG_UNBLOCK, &set, NULL); +} |