projects / deliverable / linux.git / blame
| Commit | Line | Data |
|---|---|---|
| 1da177e4 LT |
1 | #ifndef __LINUX_PREEMPT_H |
| 2 | #define __LINUX_PREEMPT_H | |
| 3 | ||
| 4 | /* | |
| 5 | * include/linux/preempt.h - macros for accessing and manipulating | |
| 6 | * preempt_count (used for kernel preemption, interrupt count, etc.) | |
| 7 | */ | |
| 8 | ||
| 9 | #include <linux/config.h> | |
| 10 | #include <linux/linkage.h> | |
| 11 | ||
| 12 | #ifdef CONFIG_DEBUG_PREEMPT | |
| 13 | extern void fastcall add_preempt_count(int val); | |
| 14 | extern void fastcall sub_preempt_count(int val); | |
| 15 | #else | |
| 16 | # define add_preempt_count(val) do { preempt_count() += (val); } while (0) | |
| 17 | # define sub_preempt_count(val) do { preempt_count() -= (val); } while (0) | |
| 18 | #endif | |
| 19 | ||
| 20 | #define inc_preempt_count() add_preempt_count(1) | |
| 21 | #define dec_preempt_count() sub_preempt_count(1) | |
| 22 | ||
| 23 | #define preempt_count() (current_thread_info()->preempt_count) | |
| 24 | ||
| 25 | #ifdef CONFIG_PREEMPT | |
| 26 | ||
| 27 | asmlinkage void preempt_schedule(void); | |
| 28 | ||
| 29 | #define preempt_disable() \ | |
| 30 | do { \ | |
| 31 | inc_preempt_count(); \ | |
| 32 | barrier(); \ | |
| 33 | } while (0) | |
| 34 | ||
| 35 | #define preempt_enable_no_resched() \ | |
| 36 | do { \ | |
| 37 | barrier(); \ | |
| 38 | dec_preempt_count(); \ | |
| 39 | } while (0) | |
| 40 | ||
| 41 | #define preempt_check_resched() \ | |
| 42 | do { \ | |
| 43 | if (unlikely(test_thread_flag(TIF_NEED_RESCHED))) \ | |
| 44 | preempt_schedule(); \ | |
| 45 | } while (0) | |
| 46 | ||
| 47 | #define preempt_enable() \ | |
| 48 | do { \ | |
| 49 | preempt_enable_no_resched(); \ | |
| 50 | preempt_check_resched(); \ | |
| 51 | } while (0) | |
| 52 | ||
| 53 | #else | |
| 54 | ||
| 55 | #define preempt_disable() do { } while (0) | |
| 56 | #define preempt_enable_no_resched() do { } while (0) | |
| 57 | #define preempt_enable() do { } while (0) | |
| 58 | #define preempt_check_resched() do { } while (0) | |
| 59 | ||
| 60 | #endif | |
| 61 | ||
| 62 | #endif /* __LINUX_PREEMPT_H */ |