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This is preliminary thread support. Do *not* use! Threading works, libraries aren't yet thread-safe.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| /* | ||
| * This file is part of eVic SDK. | ||
| * | ||
| * eVic SDK is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * eVic SDK is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with eVic SDK. If not, see <http://www.gnu.org/licenses/>. | ||
| * | ||
| * Copyright (C) 2016 ReservedField | ||
| */ | ||
|
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| #ifndef EVICSDK_ATOMICOPS_H | ||
| #define EVICSDK_ATOMICOPS_H | ||
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| #include <stdint.h> | ||
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| // extern "C" is omitted because none | ||
| // of this is going to be exported. | ||
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| /* Always inline, no extern version. */ | ||
| #define ATOMICOPS_INLINE __attribute__((always_inline)) static inline | ||
|
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| /** | ||
| * Atomically stores a 32-bit value to memory, giving | ||
| * back the old value. | ||
| * | ||
| * @param ptr Memory to store the value to. | ||
| * @param newVal Value to store. | ||
| * | ||
| * @return Old value. | ||
| */ | ||
| ATOMICOPS_INLINE uint32_t AtomicOps_Swap(volatile uint32_t *ptr, uint32_t newVal) { | ||
| uint32_t oldVal, strexRet; | ||
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| // TODO: too many memory barriers? | ||
| asm volatile("@ AtomicOps_Swap\n\t" | ||
| "dmb\n" | ||
| "1:\n\t" | ||
| "ldrex %0, [%2]\n\t" | ||
| "strex %1, %3, [%2]\n\t" | ||
| "teq %1, #0\n\t" | ||
| "bne 1b\n\t" | ||
| "dmb" | ||
| : "=&r" (oldVal), "=&r" (strexRet) | ||
| : "r" (ptr), "r" (newVal) | ||
| : "memory", "cc"); | ||
|
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| return oldVal; | ||
| } | ||
|
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| /** | ||
| * Atomically stores a 32-bit value to memory, only if | ||
| * the value currently in memory is equal to the expected | ||
| * value, giving back the old value. | ||
| * | ||
| * @param ptr Memory to store the value to. | ||
| * @param expVal Expected value. | ||
| * @param newVal Value to store. | ||
| * | ||
| * @return Old value. | ||
| */ | ||
| ATOMICOPS_INLINE uint32_t AtomicOps_CmpSwap(volatile uint32_t *ptr, uint32_t expVal, uint32_t newVal) { | ||
| uint32_t loadVal, strexRet; | ||
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| // TODO: too many memory barriers? | ||
| asm volatile("@ AtomicOps_CmpSwap\n\t" | ||
| "dmb\n" | ||
| "1:\n\t" | ||
| "ldrex %0, [%2]\n\t" | ||
| "teq %0, %3\n\t" | ||
| "itt eq\n\t" | ||
| "strexeq %1, %4, [%2]\n\t" | ||
| "teqeq %1, #1\n\t" | ||
| "beq 1b\n\t" | ||
| "dmb" | ||
| : "=&r" (loadVal), "=&r" (strexRet) | ||
| : "r" (ptr), "r" (expVal), "r" (newVal) | ||
| : "memory", "cc"); | ||
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| return loadVal; | ||
| } | ||
|
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| /** | ||
| * Atomically adds to a 32-bit value in memory. | ||
| * | ||
| * @param ptr Memory where the first addend is and | ||
| * where the result will be stored. | ||
| * @param n Second addend. | ||
| * | ||
| * @return New value after addition. | ||
| */ | ||
| ATOMICOPS_INLINE uint32_t AtomicOps_Add(volatile uint32_t *ptr, uint32_t n) { | ||
| uint32_t result, strexRet; | ||
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| // TODO: too many memory barriers? | ||
| asm volatile("@ AtomicOps_Add:\n\t" | ||
| "dmb\n" | ||
| "1:\n\t" | ||
| "ldrex %0, [%2]\n\t" | ||
| "add %0, %0, %3\n\t" | ||
| "strex %1, %0, [%2]\n\t" | ||
| "teq %1, #0\n\t" | ||
| "bne 1b\n\t" | ||
| "dmb" | ||
| : "=&r" (result), "=&r" (strexRet) | ||
| : "r" (ptr), "r" (n) | ||
| : "memory", "cc"); | ||
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| return result; | ||
| } | ||
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| #undef ATOMICOPS_INLINE | ||
|
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| #endif |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| /* | ||
| * This file is part of eVic SDK. | ||
| * | ||
| * eVic SDK is free software: you can redistribute it and/or modify | ||
| * it under the terms of the GNU General Public License as published by | ||
| * the Free Software Foundation, either version 3 of the License, or | ||
| * (at your option) any later version. | ||
| * | ||
| * eVic SDK is distributed in the hope that it will be useful, | ||
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| * GNU General Public License for more details. | ||
| * | ||
| * You should have received a copy of the GNU General Public License | ||
| * along with eVic SDK. If not, see <http://www.gnu.org/licenses/>. | ||
| * | ||
| * Copyright (C) 2016 ReservedField | ||
| */ | ||
|
|
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| #ifndef EVICSDK_QUEUE_H | ||
| #define EVICSDK_QUEUE_H | ||
|
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| #include <stdlib.h> | ||
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| #ifdef __cplusplus | ||
| extern "C" { | ||
| #endif | ||
|
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| /** | ||
| * Queue. | ||
| */ | ||
| typedef struct { | ||
| /**< First item in queue. NULL when queue is empty. */ | ||
| void *head; | ||
| /**< Last item in queue. */ | ||
| void *tail; | ||
| } Queue_t; | ||
|
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| /** | ||
| * Queue item header. | ||
| * This MUST be the first field in every item. | ||
| */ | ||
| typedef struct { | ||
| /** Next item in queue. */ | ||
| void *next; | ||
| } Queue_Header_t; | ||
|
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| /** | ||
| * Initializes an user-allocated queue. | ||
| * | ||
| * @param queue Queue. | ||
| */ | ||
| void Queue_Init(Queue_t *queue); | ||
|
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| /** | ||
| * Pushes an item to the front of the queue. | ||
| * | ||
| * @param queue Queue. | ||
| * @param item Item to push. | ||
| */ | ||
| void Queue_PushFront(Queue_t *queue, void *item); | ||
|
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| /** | ||
| * Pushes an item to the back of the queue. | ||
| * | ||
| * @param queue Queue. | ||
| * @param item Item to push. | ||
| */ | ||
| void Queue_PushBack(Queue_t *queue, void *item); | ||
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| /** | ||
| * Pops the first item off the queue. | ||
| * | ||
| * @param queue Queue. | ||
| * | ||
| * @return First item, or NULL if the queue is empty. | ||
| */ | ||
| void *Queue_PopFront(Queue_t *queue); | ||
|
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| /** | ||
| * Removes an item from the queue. | ||
| * | ||
| * @param queue Queue. | ||
| * @param prev Item preceding the one to be removed, | ||
| * or NULL if removing the first item. | ||
| * @param item Item to remove. | ||
| */ | ||
| void Queue_Remove(Queue_t *queue, void *prev, void *item); | ||
|
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| #ifdef __cplusplus | ||
| } | ||
| #endif | ||
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| #endif |
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