mirror of
https://github.com/schoebel/mars
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84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
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// (c) 2010 Thomas Schoebel-Theuer / 1&1 Internet AG
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#ifndef BRICK_ATOMIC_H
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#define BRICK_ATOMIC_H
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#include <linux/spinlock.h>
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#include <asm/atomic.h>
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#include "brick_checking.h"
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#define ATOMIC_DEBUGGING
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#ifndef CONFIG_MARS_DEBUG
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#undef ATOMIC_DEBUGGING
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#endif
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#define ATOMIC_MAXTRACE 64
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/* Trivial wrapper to force type checking.
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*/
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typedef struct tatomic {
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atomic_t ta_atomic;
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} tatomic_t;
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typedef struct atomic_trace {
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#ifdef ATOMIC_DEBUGGING
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atomic_t at_count;
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short at_lines[ATOMIC_MAXTRACE];
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#endif
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} atomic_trace_t;
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#ifdef ATOMIC_DEBUGGING
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#define tatomic_trace(_at, _cmd) \
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({ \
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int _index = atomic_add_return(1, &(_at)->at_count) - 1; \
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if (_index >= 0 && _index < ATOMIC_MAXTRACE) { \
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(_at)->at_lines[_index] = __LINE__; \
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} \
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_cmd; \
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})
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#define tatomic_out(_at,_MSG) \
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({ \
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int __i; \
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int __max = atomic_read(&(_at)->at_count); \
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_MSG("at_count = %d\n", __max); \
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if (__max > ATOMIC_MAXTRACE) \
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__max = ATOMIC_MAXTRACE; \
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for (__i = 0; __i < __max; __i++) { \
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_MSG("%2d %4d\n", __i, (_at)->at_lines[__i]); \
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} \
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})
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#define _CHECK_TATOMIC(_at,_atom,OP,_minval) \
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do { \
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if (BRICK_CHECKING) { \
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int __test = atomic_read(&(_atom)->ta_atomic); \
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if (__test OP (_minval)) { \
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atomic_set(&(_atom)->ta_atomic, _minval); \
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BRICK_ERR("%d: tatomic " #_atom " " #OP " " #_minval " (%d)\n", __LINE__, __test); \
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tatomic_out(_at, BRICK_DMP); \
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} \
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} \
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} while (0)
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#else
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#define tatomic_trace(_at,_cmd) _cmd
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#define _CHECK_TATOMIC(_at,_atom,OP,_minval) \
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_CHECK_ATOMIC(&(_atom)->ta_atomic, OP, _minval)
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#endif
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#define CHECK_TATOMIC(_at,_atom,_minval) \
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_CHECK_TATOMIC(_at, _atom, <, _minval)
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#define tatomic_inc(at,a) tatomic_trace(at, atomic_inc(&(a)->ta_atomic))
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#define tatomic_dec(at,a) tatomic_trace(at, atomic_dec(&(a)->ta_atomic))
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#define tatomic_dec_and_test(at,a) tatomic_trace(at, atomic_dec_and_test(&(a)->ta_atomic))
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#endif
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