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Collect platform specific bits into cor_platform
jonroach
on 2:19 PM Oct 20 2025
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#include "asleep.h"
#include "task.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <errno.h>
#include <math.h>
#include <string.h>
#include "timespec_utils.h"
typedef struct Loop_Timer {
struct timespec when;
Future *who;
} Loop_Timer;
typedef struct _ASleep {
pthread_mutex_t mutex;
unsigned users;
Loop_Timer *sleepers;
int lo;
int hi;
int max;
pthread_cond_t cond;
bool sleeploop_cancel;
pthread_t sleeploop;
bool started;
} _ASleep;
static _ASleep asleep;
static void *ASleep_Sleeper(void *param);
static void ASleep_ctor(
_ASleep *me
){
int r;
me->sleepers = NULL;
me->lo = 0;
me->hi = 0;
me->max = 0;
r = pthread_mutex_init(&me->mutex, NULL);
assert(r == 0);
r = pthread_cond_init(&me->cond, NULL);
assert(r == 0);
me->sleeploop_cancel = false;
r = pthread_create(&me->sleeploop, NULL, ASleep_Sleeper, me);
assert(r == 0);
me->started = true;
}
static void ASleep_dtor(
_ASleep *me
){
int r;
me->started = false;
me->sleeploop_cancel = true;
r = pthread_cond_signal(&me->cond);
assert(r == 0);
r = pthread_join(me->sleeploop, NULL);
assert(r == 0);
r = pthread_cond_destroy(&me->cond);
assert(r == 0);
pthread_mutex_destroy(&me->mutex);
assert(r == 0);
free(me->sleepers);
}
void ASleep_StartSystem(){
ASleep_ctor(&asleep);
}
void ASleep_StopSystem(){
ASleep_dtor(&asleep);
}
static void ASleep_AddSleeper(
_ASleep *me,
struct timespec when,
Future *who
){
int r = pthread_mutex_lock(&me->mutex);
assert(r == 0);
int nsleepers;
if (me->lo <= me->hi){
int nsleepers = me->hi - me->lo;
// ensure there's always an empty slot so that lo == hi always means no sleepers
if (nsleepers+1 >= me->max) {
me->max = (me->max == 0) ? 4 : me->max * 2;
me->sleepers = realloc(me->sleepers, me->max * sizeof(Loop_Timer));
assert(me->sleepers);
}
} else {
nsleepers = me->hi + me->max - me->lo;
// ensure there's always an empty slot so that lo == hi always means no sleepers
if (nsleepers+1 >= me->max) {
int oldmax = me->max;
me->max = (me->max == 0) ? 4 : me->max * 2;
me->sleepers = realloc(me->sleepers, me->max * sizeof(Loop_Timer));
assert(me->sleepers);
memmove(&me->sleepers[me->lo], &me->lo + me->max - oldmax, sizeof(*me->sleepers) * oldmax - me->lo);
me->lo += me->max - oldmax;
}
}
// insertion sort - we're assuming there's not going to be many sleepers active at once
int i;
int nexti;
for (i = me->hi; i != me->lo; i = nexti){
nexti = i-1;
if (i < 0){
nexti += me->max;
}
if (timespec_lte(me->sleepers[nexti].when, when)){
break;
}
me->sleepers[i] = me->sleepers[nexti];
}
me->sleepers[i].when = when;
me->sleepers[i].who = who;
me->hi += 1;
if (me->hi >= me->max){
me->hi -= me->max;
}
r = pthread_cond_signal(&me->cond);
assert(r == 0);
r = pthread_mutex_unlock(&me->mutex);
assert(r == 0);
}
static void ASleep_RemoveSleeper(
_ASleep *me,
struct timespec when,
Future *who
){
int r = pthread_mutex_lock(&me->mutex);
assert(r == 0);
int i;
for (i = me->lo; i != me->hi; ){
if (timespec_eq(me->sleepers[i].when, when) && me->sleepers[i].who == who){
int previ = i;
i += 1;
if (i >= me->max){
i -= me->max;
}
for (; i != me->hi; ){
me->sleepers[previ] = me->sleepers[i];
previ = i;
i += 1;
if (i >= me->max){
i -= me->max;
}
}
me->hi = previ;
break;
}
i += 1;
if (i >= me->max){
i -= me->max;
}
}
r = pthread_cond_signal(&me->cond);
assert(r == 0);
r = pthread_mutex_unlock(&me->mutex);
assert(r == 0);
}
static void *ASleep_Sleeper(
void *param
){
_ASleep *me = (_ASleep *)param;
int r;
while (!me->sleeploop_cancel){
r = pthread_mutex_lock(&me->mutex);
assert(r == 0);
if (me->lo != me->hi){
struct timespec when = me->sleepers[0].when;
r = pthread_mutex_unlock(&me->mutex);
assert(r == 0);
r = pthread_cond_timedwait(&me->cond, &me->mutex, &when);
assert(r == 0 || r == ETIMEDOUT);
} else {
r = pthread_mutex_unlock(&me->mutex);
assert(r == 0);
r = pthread_cond_wait(&me->cond, &me->mutex);
assert(r == 0);
}
// issue any due timers
struct timespec now;
r = clock_gettime(CLOCK_REALTIME, &now);
assert(r == 0);
while(me->lo != me->hi && timespec_lte(me->sleepers[me->lo].when, now)) {
Future *fut = me->sleepers[me->lo].who;
me->lo += 1;
if (me->lo >= me->max){
me->lo -= me->max;
}
r = pthread_mutex_unlock(&me->mutex);
assert(r == 0);
Future_SetResult(fut, false, NULL);
r = pthread_mutex_lock(&me->mutex);
assert(r == 0);
r = clock_gettime(CLOCK_REALTIME, &now);
assert(r == 0);
}
r = pthread_mutex_unlock(&me->mutex);
assert(r == 0);
}
return NULL;
}
// value is a pointer to a float delay in seconds
bool ASleep(
float delay,
void **value
){
assert(current_task && asleep.started);
if (delay < 0){
delay = 0;
}
float secs = floorf(delay);
float nsecs = (delay - secs) * 1e9;
struct timespec endtime;
clock_gettime(CLOCK_REALTIME, &endtime);
endtime.tv_nsec += (int)nsecs;
if (endtime.tv_nsec > 1000000000){
endtime.tv_sec += 1;
endtime.tv_nsec -= 1000000000;
}
endtime.tv_sec += (int)secs;
Future fut;
Future_ctor(&fut);
ASleep_AddSleeper(&asleep, endtime, &fut);
bool res = Future_Await(&fut, value);
ASleep_RemoveSleeper(&asleep, endtime, &fut);
Future_dtor(&fut);
return res;
}
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#include "asleep.h"
#include "task.h"
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <math.h>
#include <string.h>
#include "cor_platform.h"
typedef struct Loop_Timer {
int64_t when;
Future *who;
} Loop_Timer;
typedef struct _ASleep {
_Cor_Mutex mutex;
unsigned users;
Loop_Timer *sleepers;
int lo;
int hi;
int max;
_Cor_Semaphore sem;
bool sleeploop_cancel;
pthread_t sleeploop;
bool started;
} _ASleep;
static _ASleep asleep;
static void *ASleep_Sleeper(void *param);
static void ASleep_ctor(
_ASleep *me
){
int r;
me->sleepers = NULL;
me->lo = 0;
me->hi = 0;
me->max = 0;
_Cor_Mutex_ctor(&me->mutex);
_Cor_Semaphore_ctor(&me->sem);
me->sleeploop_cancel = false;
r = pthread_create(&me->sleeploop, NULL, ASleep_Sleeper, me);
assert(r == 0);
me->started = true;
}
static void ASleep_dtor(
_ASleep *me
){
int r;
me->started = false;
me->sleeploop_cancel = true;
_Cor_Semaphore_Signal(&me->sem);
r = pthread_join(me->sleeploop, NULL);
assert(r == 0);
_Cor_Sempahore_dtor(&me->sem);
_Cor_Mutex_dtor(&me->mutex);
free(me->sleepers);
}
void ASleep_StartSystem(){
ASleep_ctor(&asleep);
}
void ASleep_StopSystem(){
ASleep_dtor(&asleep);
}
static void ASleep_AddSleeper(
_ASleep *me,
int64_t when,
Future *who
){
_Cor_Mutex_Lock(&me->mutex);
int nsleepers;
if (me->lo <= me->hi){
int nsleepers = me->hi - me->lo;
// ensure there's always an empty slot so that lo == hi always means no sleepers
if (nsleepers+1 >= me->max) {
me->max = (me->max == 0) ? 4 : me->max * 2;
me->sleepers = realloc(me->sleepers, me->max * sizeof(Loop_Timer));
assert(me->sleepers);
}
} else {
nsleepers = me->hi + me->max - me->lo;
// ensure there's always an empty slot so that lo == hi always means no sleepers
if (nsleepers+1 >= me->max) {
int oldmax = me->max;
me->max = (me->max == 0) ? 4 : me->max * 2;
me->sleepers = realloc(me->sleepers, me->max * sizeof(Loop_Timer));
assert(me->sleepers);
memmove(&me->sleepers[me->lo], &me->lo + me->max - oldmax, sizeof(*me->sleepers) * oldmax - me->lo);
me->lo += me->max - oldmax;
}
}
// insertion sort - we're assuming there's not going to be many sleepers active at once
int i;
int nexti;
for (i = me->hi; i != me->lo; i = nexti){
nexti = i-1;
if (i < 0){
nexti += me->max;
}
if (me->sleepers[nexti].when <= when){
break;
}
me->sleepers[i] = me->sleepers[nexti];
}
me->sleepers[i].when = when;
me->sleepers[i].who = who;
me->hi += 1;
if (me->hi >= me->max){
me->hi -= me->max;
}
_Cor_Mutex_Unlock(&me->mutex);
_Cor_Semaphore_Signal(&me->sem);
}
static void ASleep_RemoveSleeper(
_ASleep *me,
int64_t when,
Future *who
){
_Cor_Mutex_Lock(&me->mutex);
int i;
for (i = me->lo; i != me->hi; ){
if (me->sleepers[i].when == when && me->sleepers[i].who == who){
int previ = i;
i += 1;
if (i >= me->max){
i -= me->max;
}
for (; i != me->hi; ){
me->sleepers[previ] = me->sleepers[i];
previ = i;
i += 1;
if (i >= me->max){
i -= me->max;
}
}
me->hi = previ;
break;
}
i += 1;
if (i >= me->max){
i -= me->max;
}
}
_Cor_Mutex_Unlock(&me->mutex);
_Cor_Semaphore_Signal(&me->sem);
}
static void *ASleep_Sleeper(
void *param
){
_ASleep *me = (_ASleep *)param;
while (!me->sleeploop_cancel){
_Cor_Mutex_Lock(&me->mutex);
bool got_one;
if (me->lo != me->hi){
int64_t when = me->sleepers[0].when;
_Cor_Mutex_Unlock(&me->mutex);
got_one = _Cor_Semaphore_Wait(&me->sem, when);
} else {
_Cor_Mutex_Unlock(&me->mutex);
got_one = _Cor_Semaphore_Wait(&me->sem, -1);
}
if (!got_one){
// timed out, so...
// issue any due timers
int64_t now = _Cor_Realtime_Now();
while(me->lo != me->hi && me->sleepers[me->lo].when <= now) {
Future *fut = me->sleepers[me->lo].who;
me->lo += 1;
if (me->lo >= me->max){
me->lo -= me->max;
}
_Cor_Mutex_Unlock(&me->mutex);
Future_SetResult(fut, false, NULL);
_Cor_Mutex_Lock(&me->mutex);
now = _Cor_Realtime_Now();
}
_Cor_Mutex_Unlock(&me->mutex);
}
}
return NULL;
}
// value is a pointer to a float delay in seconds
bool ASleep(
float delay,
void **value
){
assert(current_task && asleep.started);
if (delay < 0){
delay = 0;
}
int64_t endtime = _Cor_Realtime_Now() + (int64_t)(delay * 1000000000);
Future fut;
Future_ctor(&fut);
ASleep_AddSleeper(&asleep, endtime, &fut);
bool res = Future_Await(&fut, value);
ASleep_RemoveSleeper(&asleep, endtime, &fut);
Future_dtor(&fut);
return res;
}