runtime: refactor proc.c

1. Rename 'g' and 'm' local vars to 'gp' and 'mp' (convention already used in some functions)
'g' and 'm' are global vars that mean current goroutine and current machine,
when they are shadowed by local vars, it's confusing, no ability to debug log both, etc.
2. White-space shuffling.
No semantic changes.
In preparation to bigger changes.

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/6355061

src/pkg/runtime/proc.c

@@ -275,11 +275,11 @@ runtime·goexit(void)
 }
 
 void
-runtime·goroutineheader(G *g)
+runtime·goroutineheader(G *gp)
 {
 	int8 *status;
 
-	switch(g->status) {
+	switch(gp->status) {
 	case Gidle:
 		status = "idle";
 		break;
@@ -293,8 +293,8 @@ runtime·goroutineheader(G *g)
 		status = "syscall";
 		break;
 	case Gwaiting:
-		if(g->waitreason)
-			status = g->waitreason;
+		if(gp->waitreason)
+			status = gp->waitreason;
 		else
 			status = "waiting";
 		break;
@@ -305,20 +305,20 @@ runtime·goroutineheader(G *g)
 		status = "???";
 		break;
 	}
-	runtime·printf("goroutine %d [%s]:\n", g->goid, status);
+	runtime·printf("goroutine %d [%s]:\n", gp->goid, status);
 }
 
 void
 runtime·tracebackothers(G *me)
 {
-	G *g;
+	G *gp;
 
-	for(g = runtime·allg; g != nil; g = g->alllink) {
-		if(g == me || g->status == Gdead)
+	for(gp = runtime·allg; gp != nil; gp = gp->alllink) {
+		if(gp == me || gp->status == Gdead)
 			continue;
 		runtime·printf("\n");
-		runtime·goroutineheader(g);
-		runtime·traceback(g->sched.pc, (byte*)g->sched.sp, 0, g);
+		runtime·goroutineheader(gp);
+		runtime·traceback(gp->sched.pc, (byte*)gp->sched.sp, 0, gp);
 	}
 }
 
@@ -335,24 +335,24 @@ runtime·idlegoroutine(void)
 }
 
 static void
-mcommoninit(M *m)
+mcommoninit(M *mp)
 {
-	m->id = runtime·sched.mcount++;
-	m->fastrand = 0x49f6428aUL + m->id + runtime·cputicks();
-	m->stackalloc = runtime·malloc(sizeof(*m->stackalloc));
-	runtime·FixAlloc_Init(m->stackalloc, FixedStack, runtime·SysAlloc, nil, nil);
+	mp->id = runtime·sched.mcount++;
+	mp->fastrand = 0x49f6428aUL + mp->id + runtime·cputicks();
+	mp->stackalloc = runtime·malloc(sizeof(*mp->stackalloc));
+	runtime·FixAlloc_Init(mp->stackalloc, FixedStack, runtime·SysAlloc, nil, nil);
 
-	if(m->mcache == nil)
-		m->mcache = runtime·allocmcache();
+	if(mp->mcache == nil)
+		mp->mcache = runtime·allocmcache();
 
-	runtime·callers(1, m->createstack, nelem(m->createstack));
+	runtime·callers(1, mp->createstack, nelem(mp->createstack));
 
 	// Add to runtime·allm so garbage collector doesn't free m
 	// when it is just in a register or thread-local storage.
-	m->alllink = runtime·allm;
+	mp->alllink = runtime·allm;
 	// runtime·NumCgoCall() iterates over allm w/o schedlock,
 	// so we need to publish it safely.
-	runtime·atomicstorep(&runtime·allm, m);
+	runtime·atomicstorep(&runtime·allm, mp);
 }
 
 // Try to increment mcpu.  Report whether succeeded.
@@ -372,34 +372,34 @@ canaddmcpu(void)
 
 // Put on `g' queue.  Sched must be locked.
 static void
-gput(G *g)
+gput(G *gp)
 {
-	M *m;
+	M *mp;
 
 	// If g is wired, hand it off directly.
-	if((m = g->lockedm) != nil && canaddmcpu()) {
-		mnextg(m, g);
+	if((mp = gp->lockedm) != nil && canaddmcpu()) {
+		mnextg(mp, gp);
 		return;
 	}
 
 	// If g is the idle goroutine for an m, hand it off.
-	if(g->idlem != nil) {
-		if(g->idlem->idleg != nil) {
+	if(gp->idlem != nil) {
+		if(gp->idlem->idleg != nil) {
 			runtime·printf("m%d idle out of sync: g%d g%d\n",
-				g->idlem->id,
-				g->idlem->idleg->goid, g->goid);
+				gp->idlem->id,
+				gp->idlem->idleg->goid, gp->goid);
 			runtime·throw("runtime: double idle");
 		}
-		g->idlem->idleg = g;
+		gp->idlem->idleg = gp;
 		return;
 	}
 
-	g->schedlink = nil;
+	gp->schedlink = nil;
 	if(runtime·sched.ghead == nil)
-		runtime·sched.ghead = g;
+		runtime·sched.ghead = gp;
 	else
-		runtime·sched.gtail->schedlink = g;
-	runtime·sched.gtail = g;
+		runtime·sched.gtail->schedlink = gp;
+	runtime·sched.gtail = gp;
 
 	// increment gwait.
 	// if it transitions to nonzero, set atomic gwaiting bit.
@@ -418,11 +418,11 @@ haveg(void)
 static G*
 gget(void)
 {
-	G *g;
+	G *gp;
 
-	g = runtime·sched.ghead;
-	if(g){
-		runtime·sched.ghead = g->schedlink;
+	gp = runtime·sched.ghead;
+	if(gp) {
+		runtime·sched.ghead = gp->schedlink;
 		if(runtime·sched.ghead == nil)
 			runtime·sched.gtail = nil;
 		// decrement gwait.
@@ -430,45 +430,45 @@ gget(void)
 		if(--runtime·sched.gwait == 0)
 			runtime·xadd(&runtime·sched.atomic, -1<<gwaitingShift);
 	} else if(m->idleg != nil) {
-		g = m->idleg;
+		gp = m->idleg;
 		m->idleg = nil;
 	}
-	return g;
+	return gp;
 }
 
 // Put on `m' list.  Sched must be locked.
 static void
-mput(M *m)
+mput(M *mp)
 {
-	m->schedlink = runtime·sched.mhead;
-	runtime·sched.mhead = m;
+	mp->schedlink = runtime·sched.mhead;
+	runtime·sched.mhead = mp;
 	runtime·sched.mwait++;
 }
 
 // Get an `m' to run `g'.  Sched must be locked.
 static M*
-mget(G *g)
+mget(G *gp)
 {
-	M *m;
+	M *mp;
 
 	// if g has its own m, use it.
-	if(g && (m = g->lockedm) != nil)
-		return m;
+	if(gp && (mp = gp->lockedm) != nil)
+		return mp;
 
 	// otherwise use general m pool.
-	if((m = runtime·sched.mhead) != nil){
-		runtime·sched.mhead = m->schedlink;
+	if((mp = runtime·sched.mhead) != nil) {
+		runtime·sched.mhead = mp->schedlink;
 		runtime·sched.mwait--;
 	}
-	return m;
+	return mp;
 }
 
 // Mark g ready to run.
 void
-runtime·ready(G *g)
+runtime·ready(G *gp)
 {
 	schedlock();
-	readylocked(g);
+	readylocked(gp);
 	schedunlock();
 }
 
@@ -476,23 +476,23 @@ runtime·ready(G *g)
 // G might be running already and about to stop.
 // The sched lock protects g->status from changing underfoot.
 static void
-readylocked(G *g)
+readylocked(G *gp)
 {
-	if(g->m){
+	if(gp->m) {
 		// Running on another machine.
 		// Ready it when it stops.
-		g->readyonstop = 1;
+		gp->readyonstop = 1;
 		return;
 	}
 
 	// Mark runnable.
-	if(g->status == Grunnable || g->status == Grunning) {
-		runtime·printf("goroutine %d has status %d\n", g->goid, g->status);
+	if(gp->status == Grunnable || gp->status == Grunning) {
+		runtime·printf("goroutine %d has status %d\n", gp->goid, gp->status);
 		runtime·throw("bad g->status in ready");
 	}
-	g->status = Grunnable;
+	gp->status = Grunnable;
 
-	gput(g);
+	gput(gp);
 	matchmg();
 }
 
@@ -505,24 +505,24 @@ nop(void)
 // debuggers can set a breakpoint here and catch all
 // new goroutines.
 static void
-newprocreadylocked(G *g)
+newprocreadylocked(G *gp)
 {
 	nop();	// avoid inlining in 6l
-	readylocked(g);
+	readylocked(gp);
 }
 
 // Pass g to m for running.
 // Caller has already incremented mcpu.
 static void
-mnextg(M *m, G *g)
+mnextg(M *mp, G *gp)
 {
 	runtime·sched.grunning++;
-	m->nextg = g;
-	if(m->waitnextg) {
-		m->waitnextg = 0;
+	mp->nextg = gp;
+	if(mp->waitnextg) {
+		mp->waitnextg = 0;
 		if(mwakeup != nil)
 			runtime·notewakeup(&mwakeup->havenextg);
-		mwakeup = m;
+		mwakeup = mp;
 	}
 }
 
@@ -719,7 +719,7 @@ runtime·stoptheworld(void)
 void
 runtime·starttheworld(void)
 {
-	M *m;
+	M *mp;
 	int32 max;
 	
 	// Figure out how many CPUs GC could possibly use.
@@ -747,8 +747,8 @@ runtime·starttheworld(void)
 		// but m is not running a specific goroutine,
 		// so set the helpgc flag as a signal to m's
 		// first schedule(nil) to mcpu-- and grunning--.
-		m = runtime·newm();
-		m->helpgc = 1;
+		mp = runtime·newm();
+		mp->helpgc = 1;
 		runtime·sched.grunning++;
 	}
 	schedunlock();
@@ -827,10 +827,10 @@ matchmg(void)
 M*
 runtime·newm(void)
 {
-	M *m;
+	M *mp;
 
-	m = runtime·malloc(sizeof(M));
-	mcommoninit(m);
+	mp = runtime·malloc(sizeof(M));
+	mcommoninit(mp);
 
 	if(runtime·iscgo) {
 		CgoThreadStart ts;
@@ -838,21 +838,21 @@ runtime·newm(void)
 		if(libcgo_thread_start == nil)
 			runtime·throw("libcgo_thread_start missing");
 		// pthread_create will make us a stack.
-		m->g0 = runtime·malg(-1);
-		ts.m = m;
-		ts.g = m->g0;
+		mp->g0 = runtime·malg(-1);
+		ts.m = mp;
+		ts.g = mp->g0;
 		ts.fn = runtime·mstart;
 		runtime·asmcgocall(libcgo_thread_start, &ts);
 	} else {
 		if(Windows)
 			// windows will layout sched stack on os stack
-			m->g0 = runtime·malg(-1);
+			mp->g0 = runtime·malg(-1);
 		else
-			m->g0 = runtime·malg(8192);
-		runtime·newosproc(m, m->g0, (byte*)m->g0->stackbase, runtime·mstart);
+			mp->g0 = runtime·malg(8192);
+		runtime·newosproc(mp, mp->g0, (byte*)mp->g0->stackbase, runtime·mstart);
 	}
 
-	return m;
+	return mp;
 }
 
 // One round of scheduler: find a goroutine and run it.
@@ -876,7 +876,7 @@ schedule(G *gp)
 		if(atomic_mcpu(v) > maxgomaxprocs)
 			runtime·throw("negative mcpu in scheduler");
 
-		switch(gp->status){
+		switch(gp->status) {
 		case Grunnable:
 		case Gdead:
 			// Shouldn't have been running!
@@ -898,7 +898,7 @@ schedule(G *gp)
 				runtime·exit(0);
 			break;
 		}
-		if(gp->readyonstop){
+		if(gp->readyonstop) {
 			gp->readyonstop = 0;
 			readylocked(gp);
 		}
@@ -1281,7 +1281,7 @@ runtime·newproc1(byte *fn, byte *argp, int32 narg, int32 nret, void *callerpc)
 
 	schedlock();
 
-	if((newg = gfget()) != nil){
+	if((newg = gfget()) != nil) {
 		if(newg->stackguard - StackGuard != newg->stack0)
 			runtime·throw("invalid stack in newg");
 	} else {
@@ -1333,7 +1333,7 @@ runtime·deferproc(int32 siz, byte* fn, ...)
 {
 	Defer *d;
 	int32 mallocsiz;
- 
+
 	mallocsiz = sizeof(*d);
 	if(siz > sizeof(d->args))
 		mallocsiz += siz - sizeof(d->args);
@@ -1602,24 +1602,24 @@ nomatch:
 
 // Put on gfree list.  Sched must be locked.
 static void
-gfput(G *g)
+gfput(G *gp)
 {
-	if(g->stackguard - StackGuard != g->stack0)
+	if(gp->stackguard - StackGuard != gp->stack0)
 		runtime·throw("invalid stack in gfput");
-	g->schedlink = runtime·sched.gfree;
-	runtime·sched.gfree = g;
+	gp->schedlink = runtime·sched.gfree;
+	runtime·sched.gfree = gp;
 }
 
 // Get from gfree list.  Sched must be locked.
 static G*
 gfget(void)
 {
-	G *g;
+	G *gp;
 
-	g = runtime·sched.gfree;
-	if(g)
-		runtime·sched.gfree = g->schedlink;
-	return g;
+	gp = runtime·sched.gfree;
+	if(gp)
+		runtime·sched.gfree = gp->schedlink;
+	return gp;
 }
 
 void