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| author | Marc G. Fournier <scrappy@hub.org> | 1996-07-09 06:22:35 +0000 |
|---|---|---|
| committer | Marc G. Fournier <scrappy@hub.org> | 1996-07-09 06:22:35 +0000 |
| commit | d31084e9d1118b25fd16580d9d8c2924b5740dff (patch) | |
| tree | 3179e66307d54df9c7b966543550e601eb55e668 /src/backend/port/sparc_solaris/tas.s | |
| download | postgresql-PG95-1_01.tar.gz postgresql-PG95-1_01.zip | |
Postgres95 1.01 Distribution - Virgin SourcesPG95-1_01
Diffstat (limited to 'src/backend/port/sparc_solaris/tas.s')
| -rw-r--r-- | src/backend/port/sparc_solaris/tas.s | 50 |
1 files changed, 50 insertions, 0 deletions
diff --git a/src/backend/port/sparc_solaris/tas.s b/src/backend/port/sparc_solaris/tas.s new file mode 100644 index 00000000000..e09c2d4ad3c --- /dev/null +++ b/src/backend/port/sparc_solaris/tas.s @@ -0,0 +1,50 @@ + !! + !! $Header: /cvsroot/pgsql/src/backend/port/sparc_solaris/Attic/tas.s,v 1.1.1.1 1996/07/09 06:21:45 scrappy Exp $ + !! + !! this would be a piece of inlined assembler but it appears + !! to be easier to just write the assembler than to try to + !! figure out how to make sure that in/out registers are kept + !! straight in the asm's. + !! + .file "tas.c" +.section ".text" + .align 4 + .global tas + .type tas,#function + .proc 04 +tas: + !! + !! this is a leaf procedure - no need to save windows and + !! diddle the CWP. + !! + !#PROLOGUE# 0 + !#PROLOGUE# 1 + + !! + !! write 0xFF into the lock address, saving the old value in %o0. + !! this is an atomic action, even on multiprocessors. + !! + ldstub [%o0],%o0 + + !! + !! if it was already set when we set it, somebody else already + !! owned the lock -- return 1. + !! + cmp %o0,0 + bne .LL2 + mov 1,%o0 + + !! + !! otherwise, it was clear and we now own the lock -- return 0. + !! + mov 0,%o0 +.LL2: + !! + !! this is a leaf procedure - no need to restore windows and + !! diddle the CWP. + !! + retl + nop +.LLfe1: + .size tas,.LLfe1-tas + .ident "GCC: (GNU) 2.5.8" |