Skip to content
Projects
Groups
Snippets
Help
Loading...
Help
Support
Keyboard shortcuts
?
Submit feedback
Contribute to GitLab
Sign in / Register
Toggle navigation
M
mariadb
Project overview
Project overview
Details
Activity
Releases
Repository
Repository
Files
Commits
Branches
Tags
Contributors
Graph
Compare
Issues
0
Issues
0
List
Boards
Labels
Milestones
Merge Requests
0
Merge Requests
0
Analytics
Analytics
Repository
Value Stream
Wiki
Wiki
Snippets
Snippets
Members
Members
Collapse sidebar
Close sidebar
Activity
Graph
Create a new issue
Commits
Issue Boards
Open sidebar
Kirill Smelkov
mariadb
Commits
466870b2
Commit
466870b2
authored
17 years ago
by
sunny
Browse files
Options
Browse Files
Download
Email Patches
Plain Diff
Fixed inline asm code, it didn't work with GCC > ver 3.x.
parent
4c2b6807
No related merge requests found
Changes
1
Hide whitespace changes
Inline
Side-by-side
Showing
1 changed file
with
13 additions
and
24 deletions
+13
-24
include/sync0sync.ic
include/sync0sync.ic
+13
-24
No files found.
include/sync0sync.ic
View file @
466870b2
...
...
@@ -6,6 +6,16 @@ Mutex, the basic synchronization primitive
Created 9/5/1995 Heikki Tuuri
*******************************************************/
#if defined(not_defined) && defined(__GNUC__) && defined(UNIV_INTEL_X86)
/* %z0: Use the size of operand %0 which in our case is *m to determine
instruction size, it should end up as xchgl. "1" in the input constraint,
says that "in" has to go in the same place as "out".*/
#define TAS(m, in, out) \
asm volatile ("xchg%z0 %2, %0" \
: "=g" (*(m)), "=r" (out) \
: "1" (in)) /* Note: "1" here refers to "=r" (out) */
#endif
/**********************************************************************
Sets the waiters field in a mutex. */
...
...
@@ -89,20 +99,10 @@ mutex_test_and_set(
return(res);
#elif defined(not_defined) && defined(__GNUC__) && defined(UNIV_INTEL_X86)
ulint* lw;
ulint res;
lw = &(mutex->lock_word);
/* In assembly we use the so-called AT & T syntax where
the order of operands is inverted compared to the ordinary Intel
syntax. The 'l' after the mnemonics denotes a 32-bit operation.
The line after the code tells which values come out of the asm
code, and the second line tells the input to the asm code. */
TAS(&mutex->lock_word, 1, res);
asm volatile("movl $1, %%eax; xchgl (%%ecx), %%eax" :
"=eax" (res), "=m" (*lw) :
"ecx" (lw));
return(res);
#else
ibool ret;
...
...
@@ -141,20 +141,9 @@ mutex_reset_lock_word(
__asm MOV ECX, lw
__asm XCHG EDX, DWORD PTR [ECX]
#elif defined(not_defined) && defined(__GNUC__) && defined(UNIV_INTEL_X86)
ulint* lw;
lw = &(mutex->lock_word);
/* In assembly we use the so-called AT & T syntax where
the order of operands is inverted compared to the ordinary Intel
syntax. The 'l' after the mnemonics denotes a 32-bit operation. */
ulint res;
asm volatile("movl $0, %%eax; xchgl (%%ecx), %%eax" :
"=m" (*lw) :
"ecx" (lw) :
"eax"); /* gcc does not seem to understand
that our asm code resets eax: tell it
explicitly that after the third ':' */
TAS(&mutex->lock_word, 0, res);
#else
mutex->lock_word = 0;
...
...
This diff is collapsed.
Click to expand it.
Write
Preview
Markdown
is supported
0%
Try again
or
attach a new file
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment