+#include <stdio.h>
#include <string.h>
+#include <sys/mman.h>
+#include <linux/futex.h>
+
+/* hack for mips: */
+#define CONFIG_RCU_HAVE_FUTEX 1
+#include <urcu/futex.h>
-#include <linux/math64.h>
-#include <linux/printk.h>
#include <linux/rcupdate.h>
#include <linux/sched.h>
#include <linux/timer.h>
/* returns true if process was woken up, false if it was already running */
int wake_up_process(struct task_struct *p)
{
- int ret;
+ int ret = p->state != TASK_RUNNING;
- pthread_mutex_lock(&p->lock);
- ret = p->state != TASK_RUNNING;
p->state = TASK_RUNNING;
-
- pthread_cond_signal(&p->wait);
- pthread_mutex_unlock(&p->lock);
-
+ futex(&p->state, FUTEX_WAKE|FUTEX_PRIVATE_FLAG,
+ INT_MAX, NULL, NULL, 0);
return ret;
}
void schedule(void)
{
- rcu_quiescent_state();
-
- pthread_mutex_lock(¤t->lock);
+ int v;
- while (current->state != TASK_RUNNING)
- pthread_cond_wait(¤t->wait, ¤t->lock);
+ rcu_quiescent_state();
- pthread_mutex_unlock(¤t->lock);
+ while ((v = READ_ONCE(current->state)) != TASK_RUNNING)
+ futex(¤t->state, FUTEX_WAIT|FUTEX_PRIVATE_FLAG,
+ v, NULL, NULL, 0);
}
-static void process_timeout(unsigned long __data)
+struct process_timer {
+ struct timer_list timer;
+ struct task_struct *task;
+};
+
+static void process_timeout(struct timer_list *t)
{
- wake_up_process((struct task_struct *)__data);
+ struct process_timer *timeout =
+ container_of(t, struct process_timer, timer);
+
+ wake_up_process(timeout->task);
}
long schedule_timeout(long timeout)
{
- struct timer_list timer;
+ struct process_timer timer;
unsigned long expire;
switch (timeout)
* that will tell you if something is gone wrong and where.
*/
if (timeout < 0) {
- printk(KERN_ERR "schedule_timeout: wrong timeout "
+ fprintf(stderr, "schedule_timeout: wrong timeout "
"value %lx\n", timeout);
current->state = TASK_RUNNING;
goto out;
expire = timeout + jiffies;
- setup_timer(&timer, process_timeout, (unsigned long)current);
- mod_timer(&timer, expire);
+ timer.task = current;
+ timer_setup_on_stack(&timer.timer, process_timeout, 0);
+ mod_timer(&timer.timer, expire);
schedule();
- del_timer_sync(&timer);
+ del_timer_sync(&timer.timer);
timeout = expire - jiffies;
out:
return timeout < 0 ? 0 : timeout;
}
-unsigned long __msecs_to_jiffies(const unsigned int m)
-{
- /*
- * Negative value, means infinite timeout:
- */
- if ((int)m < 0)
- return MAX_JIFFY_OFFSET;
- return _msecs_to_jiffies(m);
-}
-
-u64 nsecs_to_jiffies64(u64 n)
-{
-#if (NSEC_PER_SEC % HZ) == 0
- /* Common case, HZ = 100, 128, 200, 250, 256, 500, 512, 1000 etc. */
- return div_u64(n, NSEC_PER_SEC / HZ);
-#elif (HZ % 512) == 0
- /* overflow after 292 years if HZ = 1024 */
- return div_u64(n * HZ / 512, NSEC_PER_SEC / 512);
-#else
- /*
- * Generic case - optimized for cases where HZ is a multiple of 3.
- * overflow after 64.99 years, exact for HZ = 60, 72, 90, 120 etc.
- */
- return div_u64(n * 9, (9ull * NSEC_PER_SEC + HZ / 2) / HZ);
-#endif
-}
-
-unsigned long nsecs_to_jiffies(u64 n)
-{
- return (unsigned long)nsecs_to_jiffies64(n);
-}
-
-unsigned int jiffies_to_msecs(const unsigned long j)
-{
-#if HZ <= MSEC_PER_SEC && !(MSEC_PER_SEC % HZ)
- return (MSEC_PER_SEC / HZ) * j;
-#elif HZ > MSEC_PER_SEC && !(HZ % MSEC_PER_SEC)
- return (j + (HZ / MSEC_PER_SEC) - 1)/(HZ / MSEC_PER_SEC);
-#else
-# if BITS_PER_LONG == 32
- return (HZ_TO_MSEC_MUL32 * j) >> HZ_TO_MSEC_SHR32;
-# else
- return (j * HZ_TO_MSEC_NUM) / HZ_TO_MSEC_DEN;
-# endif
-#endif
-}
-
-unsigned int jiffies_to_usecs(const unsigned long j)
-{
- /*
- * Hz usually doesn't go much further MSEC_PER_SEC.
- * jiffies_to_usecs() and usecs_to_jiffies() depend on that.
- */
- BUILD_BUG_ON(HZ > USEC_PER_SEC);
-
-#if !(USEC_PER_SEC % HZ)
- return (USEC_PER_SEC / HZ) * j;
-#else
-# if BITS_PER_LONG == 32
- return (HZ_TO_USEC_MUL32 * j) >> HZ_TO_USEC_SHR32;
-# else
- return (j * HZ_TO_USEC_NUM) / HZ_TO_USEC_DEN;
-# endif
-#endif
-}
-
__attribute__((constructor(101)))
static void sched_init(void)
{
memset(p, 0, sizeof(*p));
p->state = TASK_RUNNING;
- pthread_mutex_init(&p->lock, NULL);
- pthread_cond_init(&p->wait, NULL);
atomic_set(&p->usage, 1);
init_completion(&p->exited);
rcu_init();
rcu_register_thread();
}
+
+#ifndef SYS_getrandom
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+int urandom_fd;
+
+__attribute__((constructor(101)))
+static void rand_init(void)
+{
+ urandom_fd = open("/dev/urandom", O_RDONLY);
+ BUG_ON(urandom_fd < 0);
+}
+#endif