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Subject[patch 2.4] back port msleep(), msleep_interruptible()
On Fri, 01 Oct 2004, Jeff Garzik wrote:

> I would rather see an msleep implementation in 2.4.x...

thanks for Domen Puncer at helping out.

msleep() and msleep_interruptible() as found in current 2.6 to 2.4.
therefor also adds the helper functions ssleep(), jiffies_to_msecs(),
jiffies_to_usecs(), msecs_to_jiffies().

compile and boot tested.


Signed-off-by: Maximilian Attems <janitor@sternwelten.at>


---

include/linux/delay.h | 8 ++++++
include/linux/time.h | 41 +++++++++++++++++++++++++++++++++
kernel/Makefile | 3 +-
kernel/timer.c | 33 ++++++++++++++++++++++++++
4 files changed, 84 insertions(+), 1 deletion(-)

diff -puN kernel/Makefile~add-msleep-2.4 kernel/Makefile
--- a/kernel/Makefile~add-msleep-2.4 2004-10-30 22:48:46.000000000 +0200
+++ b/kernel/Makefile 2004-10-30 22:50:45.000000000 +0200
@@ -9,7 +9,8 @@

O_TARGET := kernel.o

-export-objs = signal.o sys.o kmod.o context.o ksyms.o pm.o exec_domain.o printk.o
+export-objs = signal.o sys.o kmod.o context.o ksyms.o pm.o exec_domain.o \
+ printk.o timer.o

obj-y = sched.o dma.o fork.o exec_domain.o panic.o printk.o \
module.o exit.o itimer.o info.o time.o softirq.o resource.o \
diff -puN kernel/timer.c~add-msleep-2.4 kernel/timer.c
--- a/kernel/timer.c~add-msleep-2.4 2004-10-30 22:48:46.000000000 +0200
+++ b/kernel/timer.c 2004-10-30 22:50:09.000000000 +0200
@@ -22,6 +22,7 @@
#include <linux/smp_lock.h>
#include <linux/interrupt.h>
#include <linux/kernel_stat.h>
+#include <linux/module.h>

#include <asm/uaccess.h>

@@ -874,3 +875,35 @@ asmlinkage long sys_nanosleep(struct tim
return 0;
}

+/**
+ * msleep - sleep safely even with waitqueue interruptions
+ * @msecs: Time in milliseconds to sleep for
+ */
+void msleep(unsigned int msecs)
+{
+ unsigned long timeout = msecs_to_jiffies(msecs) + 1;
+
+ while (timeout) {
+ set_current_state(TASK_UNINTERRUPTIBLE);
+ timeout = schedule_timeout(timeout);
+ }
+}
+
+EXPORT_SYMBOL(msleep);
+
+/**
+ * msleep_interruptible - sleep waiting for waitqueue interruptions
+ * @msecs: Time in milliseconds to sleep for
+ */
+unsigned long msleep_interruptible(unsigned int msecs)
+{
+ unsigned long timeout = msecs_to_jiffies(msecs) + 1;
+
+ while (timeout && !signal_pending(current)) {
+ set_current_state(TASK_INTERRUPTIBLE);
+ timeout = schedule_timeout(timeout);
+ }
+ return jiffies_to_msecs(timeout);
+}
+
+EXPORT_SYMBOL(msleep_interruptible);
diff -puN include/linux/delay.h~add-msleep-2.4 include/linux/delay.h
--- a/include/linux/delay.h~add-msleep-2.4 2004-10-30 22:48:46.000000000 +0200
+++ b/include/linux/delay.h 2004-10-30 22:48:46.000000000 +0200
@@ -34,4 +34,12 @@ extern unsigned long loops_per_jiffy;
({unsigned long msec=(n); while (msec--) udelay(1000);}))
#endif

+void msleep(unsigned int msecs);
+unsigned long msleep_interruptible(unsigned int msecs);
+
+static inline void ssleep(unsigned int seconds)
+{
+ msleep(seconds * 1000);
+}
+
#endif /* defined(_LINUX_DELAY_H) */
diff -puN include/linux/time.h~add-msleep-2.4 include/linux/time.h
--- a/include/linux/time.h~add-msleep-2.4 2004-10-30 22:48:46.000000000 +0200
+++ b/include/linux/time.h 2004-10-30 22:48:46.000000000 +0200
@@ -126,4 +126,45 @@ struct itimerval {
struct timeval it_value; /* current value */
};

+/*
+ * Convert jiffies to milliseconds and back.
+ *
+ * Avoid unnecessary multiplications/divisions in the
+ * two most common HZ cases:
+ */
+static inline unsigned int jiffies_to_msecs(const unsigned long j)
+{
+#if HZ <= 1000 && !(1000 % HZ)
+ return (1000 / HZ) * j;
+#elif HZ > 1000 && !(HZ % 1000)
+ return (j + (HZ / 1000) - 1)/(HZ / 1000);
+#else
+ return (j * 1000) / HZ;
+#endif
+}
+
+static inline unsigned int jiffies_to_usecs(const unsigned long j)
+{
+#if HZ <= 1000 && !(1000 % HZ)
+ return (1000000 / HZ) * j;
+#elif HZ > 1000 && !(HZ % 1000)
+ return (j*1000 + (HZ - 1000))/(HZ / 1000);
+#else
+ return (j * 1000000) / HZ;
+#endif
+}
+
+static inline unsigned long msecs_to_jiffies(const unsigned int m)
+{
+ if (m > jiffies_to_msecs(MAX_JIFFY_OFFSET))
+ return MAX_JIFFY_OFFSET;
+#if HZ <= 1000 && !(1000 % HZ)
+ return (m + (1000 / HZ) - 1) / (1000 / HZ);
+#elif HZ > 1000 && !(HZ % 1000)
+ return m * (HZ / 1000);
+#else
+ return (m * HZ + 999) / 1000;
+#endif
+}
+
#endif

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