Messages in this thread Patch in this message | | | Date | Sun, 31 Oct 2004 00:22:28 +0200 | From | maximilian attems <> | Subject | [patch 2.4] back port msleep(), msleep_interruptible() |
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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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