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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 422 | giacomo | 1 | #ifndef __LINUX_PREEMPT_H |
| 2 | #define __LINUX_PREEMPT_H |
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| 3 | |||
| 4 | /* |
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| 5 | * include/linux/preempt.h - macros for accessing and manipulating |
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| 6 | * preempt_count (used for kernel preemption, interrupt count, etc.) |
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| 7 | */ |
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| 8 | |||
| 9 | #include <linux/config.h> |
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| 10 | |||
| 11 | #define preempt_count() (current_thread_info()->preempt_count) |
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| 12 | |||
| 13 | #define inc_preempt_count() \ |
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| 14 | do { \ |
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| 15 | preempt_count()++; \ |
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| 16 | } while (0) |
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| 17 | |||
| 18 | #define dec_preempt_count() \ |
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| 19 | do { \ |
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| 20 | preempt_count()--; \ |
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| 21 | } while (0) |
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| 22 | |||
| 23 | #ifdef CONFIG_PREEMPT |
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| 24 | |||
| 25 | extern void preempt_schedule(void); |
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| 26 | |||
| 27 | #define preempt_disable() \ |
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| 28 | do { \ |
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| 29 | inc_preempt_count(); \ |
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| 30 | barrier(); \ |
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| 31 | } while (0) |
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| 32 | |||
| 33 | #define preempt_enable_no_resched() \ |
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| 34 | do { \ |
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| 35 | barrier(); \ |
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| 36 | dec_preempt_count(); \ |
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| 37 | } while (0) |
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| 38 | |||
| 39 | #define preempt_check_resched() \ |
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| 40 | do { \ |
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| 41 | if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \ |
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| 42 | preempt_schedule(); \ |
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| 43 | } while (0) |
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| 44 | |||
| 45 | #define preempt_enable() \ |
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| 46 | do { \ |
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| 47 | preempt_enable_no_resched(); \ |
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| 48 | preempt_check_resched(); \ |
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| 49 | } while (0) |
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| 50 | |||
| 51 | #else |
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| 52 | |||
| 53 | #define preempt_disable() do { } while (0) |
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| 54 | #define preempt_enable_no_resched() do { } while (0) |
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| 55 | #define preempt_enable() do { } while (0) |
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| 56 | #define preempt_check_resched() do { } while (0) |
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| 57 | |||
| 58 | #endif |
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| 59 | |||
| 60 | #endif /* __LINUX_PREEMPT_H */ |