- Include <sys/systm.h> for KASSERT().
- Move the _mtx_assert() prototype up to the top of the file with the rest
of the function prototypes.
- Define all the mtx_foo() macros in terms of mtx_foo_flags().
- Add a KASSERT() to check for invalid options in mtx_lock_flags().
- Move the mtx_assert() to ensure a mutex is owned before releasing it
in front of WITNESS_EXIT() in all the mtx_unlock_* macros.
- Change the MPASS* macros to be on #ifdef INVARIANTS, not just #ifdef
MUTEX_DEBUG since most of them check to see that the mutex functions are
called properly. Define MPASS4() in terms of KASSERT() to do this.
- Define MPASS{,[23]} in terms of MPASS4() to simplify things and avoid
code duplication.
This commit is contained in:
jhb
parent
5d3041fa5c
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9629364e62
@ -37,6 +37,7 @@
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#ifdef _KERNEL
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#include <sys/ktr.h>
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#include <sys/systm.h>
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#include <machine/atomic.h>
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#include <machine/cpufunc.h>
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#include <machine/globals.h>
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@ -134,6 +135,9 @@ void _mtx_lock_spin(struct mtx *m, int opts, u_int mtx_intr,
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const char *file, int line);
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void _mtx_unlock_spin(struct mtx *m, int opts, const char *file, int line);
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int _mtx_trylock(struct mtx *m, int opts, const char *file, int line);
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#ifdef INVARIANT_SUPPORT
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void _mtx_assert(struct mtx *m, int what, const char *file, int line);
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#endif
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/*
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* We define our machine-independent (unoptimized) mutex micro-operations
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@ -249,42 +253,16 @@ int _mtx_trylock(struct mtx *m, int opts, const char *file, int line);
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*
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* mtx_recursed(m) returns non-zero if the lock `m' is presently recursed.
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*/
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#define mtx_lock(m) do { \
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MPASS(curproc != NULL); \
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_get_sleep_lock((m), curproc, 0); \
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CTR5(KTR_LOCK, STR_mtx_lock_slp, (m)->mtx_description, (m), \
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(m)->mtx_recurse, __FILE__, __LINE__); \
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WITNESS_ENTER((m), (m)->mtx_flags, __FILE__, __LINE__); \
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} while (0)
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#define mtx_lock_spin(m) do { \
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MPASS(curproc != NULL); \
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_get_spin_lock((m), curproc, 0); \
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CTR5(KTR_LOCK, STR_mtx_lock_spn, (m)->mtx_description, (m), \
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(m)->mtx_recurse, __FILE__, __LINE__); \
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WITNESS_ENTER((m), (m)->mtx_flags, __FILE__, __LINE__); \
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} while (0)
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#define mtx_unlock(m) do { \
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MPASS(curproc != NULL); \
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WITNESS_EXIT((m), (m)->mtx_flags, __FILE__, __LINE__); \
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mtx_assert((m), MA_OWNED); \
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_rel_sleep_lock((m), curproc, 0); \
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CTR5(KTR_LOCK, STR_mtx_unlock_slp, (m)->mtx_description, (m), \
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(m)->mtx_recurse, __FILE__, __LINE__); \
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} while (0)
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#define mtx_unlock_spin(m) do { \
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MPASS(curproc != NULL); \
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WITNESS_EXIT((m), (m)->mtx_flags, __FILE__, __LINE__); \
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mtx_assert((m), MA_OWNED); \
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_rel_spin_lock((m)); \
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CTR5(KTR_LOCK, STR_mtx_unlock_spn, (m)->mtx_description, (m), \
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(m)->mtx_recurse, __FILE__, __LINE__); \
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} while (0)
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#define mtx_lock(m) mtx_lock_flags((m), 0)
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#define mtx_lock_spin(m) mtx_lock_spin_flags((m), 0)
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#define mtx_trylock(m) mtx_trylock_flags((m), 0)
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#define mtx_unlock(m) mtx_unlock_flags((m), 0)
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#define mtx_unlock_spin(m) mtx_unlock_spin_flags((m), 0)
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#define mtx_lock_flags(m, opts) do { \
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MPASS(curproc != NULL); \
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KASSERT(((opts) & MTX_NOSWITCH) == 0, \
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("MTX_NOSWITCH used at %s:%d", __FILE__, __LINE__)); \
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_get_sleep_lock((m), curproc, (opts)); \
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if (((opts) & MTX_QUIET) == 0) \
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CTR5(KTR_LOCK, STR_mtx_lock_slp, \
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@ -307,9 +285,9 @@ int _mtx_trylock(struct mtx *m, int opts, const char *file, int line);
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#define mtx_unlock_flags(m, opts) do { \
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MPASS(curproc != NULL); \
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mtx_assert((m), MA_OWNED); \
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WITNESS_EXIT((m), ((m)->mtx_flags | (opts)), __FILE__, \
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__LINE__); \
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mtx_assert((m), MA_OWNED); \
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_rel_sleep_lock((m), curproc, (opts)); \
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if (((opts) & MTX_QUIET) == 0) \
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CTR5(KTR_LOCK, STR_mtx_unlock_slp, \
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@ -317,16 +295,11 @@ int _mtx_trylock(struct mtx *m, int opts, const char *file, int line);
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__FILE__, __LINE__); \
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} while (0)
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/*
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* The MTX_SPIN unlock case is all inlined, so we handle the MTX_QUIET
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* flag right in the macro. Not a problem as if we don't have KTR_LOCK, this
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* check will be optimized out.
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*/
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#define mtx_unlock_spin_flags(m, opts) do { \
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MPASS(curproc != NULL); \
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mtx_assert((m), MA_OWNED); \
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WITNESS_EXIT((m), ((m)->mtx_flags | (opts)), __FILE__, \
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__LINE__); \
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mtx_assert((m), MA_OWNED); \
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_rel_spin_lock((m)); \
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if (((opts) & MTX_QUIET) == 0) \
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CTR5(KTR_LOCK, STR_mtx_unlock_spn, \
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@ -334,9 +307,6 @@ int _mtx_trylock(struct mtx *m, int opts, const char *file, int line);
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__FILE__, __LINE__); \
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} while (0)
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#define mtx_trylock(m) \
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_mtx_trylock((m), 0, __FILE__, __LINE__)
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#define mtx_trylock_flags(m, opts) \
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_mtx_trylock((m), (opts), __FILE__, __LINE__)
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@ -403,8 +373,6 @@ do { \
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#define MA_NOTOWNED 0x02
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#define MA_RECURSED 0x04
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#define MA_NOTRECURSED 0x08
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void _mtx_assert(struct mtx *m, int what, const char *file, int line);
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#endif /* INVARIANT_SUPPORT */
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#ifdef INVARIANTS
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@ -415,34 +383,11 @@ void _mtx_assert(struct mtx *m, int what, const char *file, int line);
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#define mtx_assert(m, what)
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#endif /* INVARIANTS */
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/*
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* The MUTEX_DEBUG-enabled MPASS*() extra sanity-check macros.
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*/
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#ifdef MUTEX_DEBUG
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#define MPASS(ex) \
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if (!(ex)) \
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panic("Assertion %s failed at %s:%d", #ex, __FILE__, \
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__LINE__)
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#define MPASS2(ex, what) \
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if (!(ex)) \
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panic("Assertion %s failed at %s:%d", what, __FILE__, \
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__LINE__)
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#define MPASS3(ex, file, line) \
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if (!(ex)) \
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panic("Assertion %s failed at %s:%d", #ex, file, line)
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#define MPASS(ex) MPASS4(ex, #ex, __FILE__, __LINE__)
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#define MPASS2(ex, what) MPASS4(ex, what, __FILE__, __LINE__)
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#define MPASS3(ex, file, line) MPASS4(ex, #ex, file, line)
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#define MPASS4(ex, what, file, line) \
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if (!(ex)) \
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panic("Assertion %s failed at %s:%d", what, file, line)
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#else /* MUTEX_DEBUG */
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#define MPASS(ex)
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#define MPASS2(ex, what)
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#define MPASS3(ex, file, line)
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#define MPASS4(ex, what, file, line)
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#endif /* MUTEX_DEBUG */
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KASSERT((ex), ("Assertion %s failed at %s:%d", what, file, line))
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/*
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* Exported WITNESS-enabled functions and corresponding wrapper macros.
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