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gstreamer/gst/gstatomic_impl.h
Johan Dahlin ecd88e381d Revert again, this time without post-commit reindent hooks to put back the indentation :-) 
Original commit message from CVS:
Revert again, this time without post-commit reindent hooks
to put back the indentation :-)
2004-03-15 14:43:35 +00:00

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/* GStreamer
* Copyright (C) 1999, 2003 Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*
*
* Much of the code in this file is taken from the Linux kernel.
* The code is relicensed under the LGPL with the kind permission of
* Linus Torvalds,Ralf Baechle and Alan Cox
*/
#ifndef __GST_ATOMIC_IMPL_H__
#define __GST_ATOMIC_IMPL_H__
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <glib.h>
#include "gstatomic.h"
#include "gstmacros.h"
G_BEGIN_DECLS
#if defined (GST_CAN_INLINE) || defined (__GST_ATOMIC_C__)
/***** Intel x86 *****/
#if defined (HAVE_CPU_I386) && defined(__GNUC__)
#ifdef GST_CONFIG_NO_SMP
#define SMP_LOCK ""
#else
#define SMP_LOCK "lock ; "
#endif
GST_INLINE_FUNC void gst_atomic_int_init (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC void gst_atomic_int_destroy (GstAtomicInt *aint) { }
GST_INLINE_FUNC void gst_atomic_int_set (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC gint gst_atomic_int_read (GstAtomicInt *aint) { return aint->counter; }
GST_INLINE_FUNC void
gst_atomic_int_add (GstAtomicInt *aint, gint val)
{
__asm__ __volatile__(
SMP_LOCK "addl %1,%0"
:"=m" (aint->counter)
:"ir" (val), "m" (aint->counter));
}
GST_INLINE_FUNC void
gst_atomic_int_inc (GstAtomicInt *aint)
{
__asm__ __volatile__(
SMP_LOCK "incl %0"
:"=m" (aint->counter)
:"m" (aint->counter));
}
GST_INLINE_FUNC gboolean
gst_atomic_int_dec_and_test (GstAtomicInt *aint)
{
guchar res;
__asm__ __volatile__(
SMP_LOCK "decl %0; sete %1"
:"=m" (aint->counter), "=qm" (res)
:"m" (aint->counter) : "memory");
return res != 0;
}
/***** PowerPC *****/
#elif defined (HAVE_CPU_PPC) && defined(__GNUC__)
#ifdef GST_CONFIG_NO_SMP
#define SMP_SYNC ""
#define SMP_ISYNC
#else
#define SMP_SYNC "\tsync\n"
#define SMP_ISYNC "\tisync\n"
#endif
/* Erratum #77 on the 405 means we need a sync or dcbt before every stwcx.
* The old ATOMIC_SYNC_FIX covered some but not all of this.
*/
#ifdef GST_CONFIG_IBM405_ERR77
#define PPC405_ERR77(ra,rb) "\tdcbt " #ra "," #rb "\n"
#else
#define PPC405_ERR77(ra,rb)
#endif
GST_INLINE_FUNC void gst_atomic_int_init (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC void gst_atomic_int_destroy (GstAtomicInt *aint) { }
GST_INLINE_FUNC void gst_atomic_int_set (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC gint gst_atomic_int_read (GstAtomicInt *aint) { return aint->counter; }
GST_INLINE_FUNC void
gst_atomic_int_add (GstAtomicInt *aint, gint val)
{
int t;
__asm__ __volatile__(
"1: lwarx %0,0,%3\n"
" add %0,%2,%0\n"
PPC405_ERR77(0,%3)
" stwcx. %0,0,%3 \n"
" bne- 1b\n"
: "=&r" (t), "=m" (aint->counter)
: "r" (val), "r" (&aint->counter), "m" (aint->counter)
: "cc");
}
GST_INLINE_FUNC void
gst_atomic_int_inc (GstAtomicInt *aint)
{
int t;
__asm__ __volatile__(
"1: lwarx %0,0,%2\n"
" addic %0,%0,1\n"
PPC405_ERR77(0,%2)
" stwcx. %0,0,%2\n"
" bne- 1b\n"
: "=&r" (t), "=m" (aint->counter)
: "r" (&aint->counter), "m" (aint->counter)
: "cc");
}
GST_INLINE_FUNC gboolean
gst_atomic_int_dec_and_test (GstAtomicInt *aint)
{
int t;
__asm__ __volatile__(
"1: lwarx %0,0,%1\n"
" addic %0,%0,-1\n"
PPC405_ERR77(0,%1)
" stwcx. %0,0,%1\n"
" bne- 1b\n"
SMP_ISYNC
: "=&r" (t)
: "r" (&aint->counter)
: "cc", "memory");
return t == 0;
}
/***** DEC[/Compaq/HP?/Intel?] Alpha *****/
#elif defined(HAVE_CPU_ALPHA) && defined(__GNUC__)
GST_INLINE_FUNC void gst_atomic_int_init (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC void gst_atomic_int_destroy (GstAtomicInt *aint) { }
GST_INLINE_FUNC void gst_atomic_int_set (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC gint gst_atomic_int_read (GstAtomicInt *aint) { return aint->counter; }
GST_INLINE_FUNC void
gst_atomic_int_add (GstAtomicInt *aint, gint val)
{
unsigned long temp;
__asm__ __volatile__(
"1: ldl_l %0,%1\n"
" addl %0,%2,%0\n"
" stl_c %0,%1\n"
" beq %0,2f\n"
".subsection 2\n"
"2: br 1b\n"
".previous"
:"=&r" (temp), "=m" (aint->counter)
:"Ir" (val), "m" (aint->counter));
}
GST_INLINE_FUNC void
gst_atomic_int_inc (GstAtomicInt *aint)
{
gst_atomic_int_add (aint, 1);
}
GST_INLINE_FUNC gboolean
gst_atomic_int_dec_and_test (GstAtomicInt *aint)
{
long temp, result;
int val = 1;
__asm__ __volatile__(
"1: ldl_l %0,%1\n"
" subl %0,%3,%2\n"
" subl %0,%3,%0\n"
" stl_c %0,%1\n"
" beq %0,2f\n"
" mb\n"
".subsection 2\n"
"2: br 1b\n"
".previous"
:"=&r" (temp), "=m" (aint->counter), "=&r" (result)
:"Ir" (val), "m" (aint->counter) : "memory");
return result == 0;
}
/***** Sun SPARC *****/
#elif 0 && defined(HAVE_CPU_SPARC) && defined(__GNUC__)
/* allegedly broken again */
GST_INLINE_FUNC void gst_atomic_int_destroy (GstAtomicInt *aint) { }
#ifdef GST_CONFIG_NO_SMP
GST_INLINE_FUNC void gst_atomic_int_init (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC void gst_atomic_int_set (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC gint gst_atomic_int_read (GstAtomicInt *aint) { return aint->counter; }
#else
GST_INLINE_FUNC void gst_atomic_int_init (GstAtomicInt *aint, gint val) { aint->counter = (val<<8); }
GST_INLINE_FUNC void gst_atomic_int_set (GstAtomicInt *aint, gint val) { aint->counter = (val<<8); }
/*
* For SMP the trick is you embed the spin lock byte within
* the word, use the low byte so signedness is easily retained
* via a quick arithmetic shift. It looks like this:
*
* ----------------------------------------
* | signed 24-bit counter value | lock | atomic_t
* ----------------------------------------
* 31 8 7 0
*/
GST_INLINE_FUNC gint
gst_atomic_int_read (GstAtomicInt *aint)
{
int ret = aint->counter;
while (ret & 0xff)
ret = aint->counter;
return ret >> 8;
}
#endif /* GST_CONFIG_NO_SMP */
GST_INLINE_FUNC void
gst_atomic_int_add (GstAtomicInt *aint, gint val)
{
volatile int increment, *ptr;
int lock = 1;
int ignore = 0;
ptr = &(aint->counter);
#if __GNUC__ > 3 || (__GNUC__ >=3 && __GNUC_MINOR__ >= 2)
__asm__ __volatile__("1: ldstub [%[ptr] + 3], %[lock]\n"
"\torcc %[lock], 0, %[ignore]\n"
"\tbne 1b\n" /* go back until we have the lock */
"\tld [%[ptr]], %[inc]\n"
"\tsra %[inc], 8, %[inc]\n"
"\tadd %[inc], %[val], %[inc]\n"
"\tsll %[inc], 8, %[lock]\n"
"\tst %[lock],[%[ptr]]\n" /* Release the lock */
: [inc] "=&r" (increment), [lock] "=r" (lock),
[ignore] "=&r" (ignore)
: "0" (increment), [ptr] "r" (ptr), [val] "r" (val)
);
#else
__asm__ __volatile__("1: ldstub [%4 + 3], %1\n"
"\torcc %1, 0, %2\n"
"\tbne 1b\n" /* go back until we have the lock */
"\tld [%4], %0\n"
"\tsra %0, 8, %0\n"
"\tadd %0, %5, %0\n"
"\tsll %0, 8, %1\n"
"\tst %1,[%4]\n" /* Release the lock */
: "=&r" (increment), "=r" (lock), "=&r" (ignore)
: "0" (increment), "r" (ptr), "r" (val)
);
#endif
}
GST_INLINE_FUNC void
gst_atomic_int_inc (GstAtomicInt *aint)
{
gst_atomic_int_add (aint, 1);
}
GST_INLINE_FUNC gboolean
gst_atomic_int_dec_and_test (GstAtomicInt *aint)
{
volatile int increment, *ptr;
int lock = 1;
int ignore = 0;
ptr = &aint->counter;
#if __GNUC__ > 3 || (__GNUC__ >=3 && __GNUC_MINOR__ >= 2)
__asm__ __volatile__("1: ldstub [%[ptr] + 3], %[lock]\n"
"\torcc %[lock], 0, %[ignore]\n"
"\tbne 1b\n" /* go back until we have the lock */
"\tld [%[ptr]], %[inc]\n"
"\tsra %[inc], 8, %[inc]\n"
"\tsub %[inc], 1, %[inc]\n"
"\tsll %[inc], 8, %[lock]\n"
"\tst %[lock],[%[ptr]]\n" /* Release the lock */
: [inc] "=&r" (increment), [lock] "=r" (lock),
[ignore] "=&r" (ignore)
: "0" (increment), [ptr] "r" (ptr)
);
#else
__asm__ __volatile__("1: ldstub [%4 + 3], %1\n"
"\torcc %1, 0, %2\n"
"\tbne 1b\n" /* go back until we have the lock */
"\tld [%4], %0\n"
"\tsra %0, 8, %0\n"
"\tsub %0, 1, %0\n"
"\tsll %0, 8, %1\n"
"\tst %1,[%4]\n" /* Release the lock */
: "=&r" (increment), "=r" (lock), "=&r" (ignore)
: "0" (increment), "r" (ptr)
);
#endif
return increment == 0;
}
/***** MIPS *****/
/* This is disabled because the asm code is broken on most MIPS
* processors and doesn't generally compile. */
#elif defined(HAVE_CPU_MIPS) && defined(__GNUC__) && 0
GST_INLINE_FUNC void gst_atomic_int_init (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC void gst_atomic_int_destroy (GstAtomicInt *aint) { }
GST_INLINE_FUNC void gst_atomic_int_set (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC gint gst_atomic_int_read (GstAtomicInt *aint) { return aint->counter; }
/* this only works on MIPS II and better */
GST_INLINE_FUNC void
gst_atomic_int_add (GstAtomicInt *aint, gint val)
{
unsigned long temp;
__asm__ __volatile__(
"1: ll %0, %1 # atomic_add\n"
" addu %0, %2 \n"
" sc %0, %1 \n"
" beqz %0, 1b \n"
: "=&r" (temp), "=m" (aint->counter)
: "Ir" (val), "m" (aint->counter));
}
GST_INLINE_FUNC void
gst_atomic_int_inc (GstAtomicInt *aint)
{
gst_atomic_int_add (aint, 1);
}
GST_INLINE_FUNC gboolean
gst_atomic_int_dec_and_test (GstAtomicInt *aint)
{
unsigned long temp, result;
int val = 1;
__asm__ __volatile__(
".set push \n"
".set noreorder # atomic_sub_return\n"
"1: ll %1, %2 \n"
" subu %0, %1, %3 \n"
" sc %0, %2 \n"
" beqz %0, 1b \n"
" subu %0, %1, %3 \n"
".set pop \n"
: "=&r" (result), "=&r" (temp), "=m" (aint->counter)
: "Ir" (val), "m" (aint->counter)
: "memory");
return result == 0;
}
/***** S/390 *****/
#elif defined(HAVE_CPU_S390) && defined(__GNUC__)
typedef struct { volatile int counter; } atomic_t __attribute__ ((aligned (4)));
GST_INLINE_FUNC void gst_atomic_int_init (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC void gst_atomic_int_destroy (GstAtomicInt *aint) { }
GST_INLINE_FUNC void gst_atomic_int_set (GstAtomicInt *aint, gint val) { aint->counter = val; }
GST_INLINE_FUNC gint gst_atomic_int_read (GstAtomicInt *aint) { return aint->counter; }
#define __CS_LOOP(old_val, new_val, ptr, op_val, op_string) \
__asm__ __volatile__(" l %0,0(%3)\n" \
"0: lr %1,%0\n" \
op_string " %1,%4\n" \
" cs %0,%1,0(%3)\n" \
" jl 0b" \
: "=&d" (old_val), "=&d" (new_val), \
"+m" (((atomic_t *)(ptr))->counter) \
: "a" (ptr), "d" (op_val) : "cc" );
GST_INLINE_FUNC void
gst_atomic_int_add (GstAtomicInt *aint, gint val)
{
int old_val, new_val;
__CS_LOOP(old_val, new_val, aint, val, "ar");
}
GST_INLINE_FUNC void
gst_atomic_int_inc (GstAtomicInt *aint)
{
int old_val, new_val;
__CS_LOOP(old_val, new_val, aint, 1, "ar");
}
GST_INLINE_FUNC gboolean
gst_atomic_int_dec_and_test (GstAtomicInt *aint)
{
int old_val, new_val;
__CS_LOOP(old_val, new_val, aint, 1, "sr");
return new_val == 0;
}
#else
#warning consider putting your architecture specific atomic implementations here
/*
* generic implementation
*/
GST_INLINE_FUNC void
gst_atomic_int_init (GstAtomicInt *aint, gint val)
{
aint->counter = val;
aint->lock = g_mutex_new ();
}
GST_INLINE_FUNC void
gst_atomic_int_destroy (GstAtomicInt *aint)
{
g_mutex_free (aint->lock);
}
GST_INLINE_FUNC void
gst_atomic_int_set (GstAtomicInt *aint, gint val)
{
g_mutex_lock (aint->lock);
aint->counter = val;
g_mutex_unlock (aint->lock);
}
GST_INLINE_FUNC gint
gst_atomic_int_read (GstAtomicInt *aint)
{
gint res;
g_mutex_lock (aint->lock);
res = aint->counter;
g_mutex_unlock (aint->lock);
return res;
}
GST_INLINE_FUNC void
gst_atomic_int_add (GstAtomicInt *aint, gint val)
{
g_mutex_lock (aint->lock);
aint->counter += val;
g_mutex_unlock (aint->lock);
}
GST_INLINE_FUNC void
gst_atomic_int_inc (GstAtomicInt *aint)
{
g_mutex_lock (aint->lock);
aint->counter++;
g_mutex_unlock (aint->lock);
}
GST_INLINE_FUNC gboolean
gst_atomic_int_dec_and_test (GstAtomicInt *aint)
{
gboolean res;
g_mutex_lock (aint->lock);
aint->counter--;
res = (aint->counter == 0);
g_mutex_unlock (aint->lock);
return res;
}
#endif
/*
* common functions
*/
GST_INLINE_FUNC GstAtomicInt*
gst_atomic_int_new (gint val)
{
GstAtomicInt *aint;
aint = g_new0 (GstAtomicInt, 1);
gst_atomic_int_init (aint, val);
return aint;
}
GST_INLINE_FUNC void
gst_atomic_int_free (GstAtomicInt *aint)
{
gst_atomic_int_destroy (aint);
g_free (aint);
}
#endif /* defined (GST_CAN_INLINE) || defined (__GST_TRASH_STACK_C__)*/
G_END_DECLS
#endif /* __GST_ATOMIC_IMPL_H__ */
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