admin/mlib
1
0 Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Fix case of the same variable is passed as 2/3 arguments of a function.

Browse Source
This commit is contained in:
Patrick Pelissier committed 2024-11-12 22:26:45 +01:00
1 parent ae55ccfc40
commit 27b0850af4
1 file changed
+47 -2
Download Patch File Download Diff File Expand all files Collapse all files
m-shared-ptr.h
+47 -2
View File
@@ -508,6 +508,8 @@ static inline type const *M_F(name, _cref)(const shared_t *out) \
\
static inline void M_F(name, _write_read_lock)(shared_t *out, const shared_t *src) \
{ \
/* We cannot perform a write_lock and a read_lock on the same variable at the same time */ \
M_ASSERT(out != src); \
/* Need to order the locks in a total way to avoid lock deadlock. \
Indeed, two call to _set can be done in two threads with : \
T1: A := B \
@@ -530,13 +532,39 @@ static inline void M_F(name, _write_read_lock)(shared_t *out, const shared_t *sr
\
static inline void M_F(name, _write_read_unlock)(shared_t *out, const shared_t *src) \
{ \
M_ASSERT(out != src); \
/* NOTE: No need to order the unlock */ \
M_F(name, _read_unlock)(src); \
M_F(name, _write_unlock)(out); \
} \
\
static inline void M_F(name, _write_read2_lock)(shared_t *out, const shared_t *src1, const shared_t *src2) \
fattr void M_F(name, _write_read2_lock)(shared_t *out, const shared_t *src1, const shared_t *src2); \
fattr void M_F(name, _write_read2_lock)(shared_t *out, const shared_t *src1, const shared_t *src2) \
{ \
/* We can have out == src1 or out == src2 or src1 == src2 */ \
/* if src1 == src2, nothing special to do (read_lock are compatible each other )*/ \
if (out == src1) { \
if (out == src2) { \
M_F(name, _write_lock)(out); \
} else if (out < src2) { \
M_F(name, _write_lock)(out); \
M_F(name, _read_lock)(src2); \
} else { \
M_F(name, _read_lock)(src2); \
M_F(name, _write_lock)(out); \
} \
return; \
} else if (out == src2) { \
M_ASSERT(out != src1); \
if (out < src1) { \
M_F(name, _write_lock)(out); \
M_F(name, _read_lock)(src1); \
} else { \
M_F(name, _read_lock)(src1); \
M_F(name, _write_lock)(out); \
} \
return; \
} \
/* See above */ \
if (src1 > src2) { \
M_SWAP(const shared_t *, src1, src2); \
@@ -560,8 +588,25 @@ static inline void M_F(name, _write_read2_lock)(shared_t *out, const shared_t *s
} \
} \
\
static inline void M_F(name, _write_read2_unlock)(shared_t *out, const shared_t *src1, const shared_t *src2) \
fattr void M_F(name, _write_read2_unlock)(shared_t *out, const shared_t *src1, const shared_t *src2); \
fattr void M_F(name, _write_read2_unlock)(shared_t *out, const shared_t *src1, const shared_t *src2) \
{ \
/* We can have out == src1 or out == src2 or src1 == src2 */ \
/* if src1 == src2, nothing special to do (read_lock are compatible each other )*/ \
if (out == src1) { \
if (out == src2) { \
M_F(name, _write_unlock)(out); \
} else { \
M_F(name, _read_unlock)(src2); \
M_F(name, _write_unlock)(out); \
} \
return; \
} else if (out == src2) { \
M_ASSERT(out != src1); \
M_F(name, _read_unlock)(src1); \
M_F(name, _write_unlock)(out); \
return; \
} \
/* NOTE: No need to order the unlock */ \
M_F(name, _read_unlock)(src1); \
M_F(name, _read_unlock)(src2); \