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sandbox: add locking primitives

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This commit is contained in:
max 🍓
2023-02-02 21:00:40 +00:00
parent 7d3000e84d
commit 799a23014a
3 changed files with 26 additions and 1 deletions
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2
sandbox/Makefile
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@@ -6,7 +6,7 @@ BUILD_DIR := $(SANDBOX_BASE_DIR)/../build/sandbox
include $(SANDBOX_BASE_DIR)/../tools/make/gcc-host.mk
EXEC_NAME := sandbox
DIR_LIST := memblock vm base queue btree util
DIR_LIST := memblock vm base queue btree util locks
INCLUDE_DIRS := $(foreach dir,$(DIR_LIST),-I$(dir)/include)
SRC := $(foreach dir,$(DIR_LIST),$(wildcard $(dir)/*.c))
OBJ := $(addprefix $(BUILD_DIR)/,$(SRC:.c=.o))

11
sandbox/locks/include/socks/locks.h Normal file
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@@ -0,0 +1,11 @@
#ifndef SOCKS_LOCKS_H_
#define SOCKS_LOCKS_H_
typedef int __attribute__((aligned(8))) spin_lock_t;
#define SPIN_LOCK_INIT ((spin_lock_t)0)
extern void spin_lock_irqsave(spin_lock_t *lck, unsigned long *flags);
extern void spin_unlock_irqrestore(spin_lock_t *lck, unsigned long flags);
#endif

14
sandbox/locks/spinlock.c Normal file
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@@ -0,0 +1,14 @@
#include <socks/locks.h>
void spin_lock_irqsave(spin_lock_t *lck, unsigned long *flags)
{
while (!__sync_bool_compare_and_swap(lck, 0, 1)) {
/* pause */
}
}
void spin_unlock_irqrestore(spin_lock_t *lck, unsigned long flags)
{
__sync_lock_release(lck);
}