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Code0 #2

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911f47e
Cleanup for the 'Code 0' article.
Mar 13, 2013
016dc99
Remove the unused force argument in gtyield.
Mar 13, 2013
6aae3b8
Rename swtch.S into gtswtch.S.
Mar 13, 2013
6e88d46
Add Mac OS X support.
Mar 26, 2013
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13 changes: 9 additions & 4 deletions Makefile
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Original file line number Diff line number Diff line change
@@ -1,10 +1,15 @@
CFLAGS = -g -Wall
ifeq ($(shell uname), Darwin)
APPLE_CCFLAGS = -m64
APPLE_ASFLAGS = -arch x86_64
endif

gttest: gthr.o swtch.o
$(CC) -o $@ $^
CFLAGS = $(APPLE_CCFLAGS) -g -Wall

gttest: gthr.o gtswtch.o
$(CC) $(APPLE_CCFLAGS) -o $@ $^

.S.o:
as -o $@ $^
as $(APPLE_ASFLAGS) -o $@ $^

.PHONY: clean
clean:
Expand Down
24 changes: 9 additions & 15 deletions gthr.c
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Original file line number Diff line number Diff line change
Expand Up @@ -23,18 +23,16 @@ struct gt {
Unused,
Running,
Ready,
Zombie,
} st;
int excode;
};

struct gt gttbl[MaxGThreads];
struct gt *gtcur;
bool gttick;

void gtinit(void);
void gtret(int ret);
void gtswtch(struct gtctx *old, struct gtctx *new);
bool gtyield(bool force);
bool gtyield(void);
static void gtstop(void);
int gtgo(void (*f)(void));

Expand All @@ -49,25 +47,21 @@ void __attribute__((noreturn))
gtret(int ret)
{
if (gtcur != &gttbl[0]) {
gtcur->st = Zombie;
gtcur->excode = ret;
gtyield(true);
gtcur->st = Unused;
gtyield();
assert(!"reachable");
}
while (gtyield(true))
while (gtyield())
;
exit(ret);
}

bool
gtyield(bool force)
gtyield(void)
{
struct gt *p;
struct gtctx *old, *new;

if (!gttick && !force)
return false;
gttick = 0;
p = gtcur;
while (p->st != Ready) {
if (++p == &gttbl[MaxGThreads])
Expand All @@ -76,7 +70,7 @@ gtyield(bool force)
return false;
}

if (gtcur->st != Zombie)
if (gtcur->st != Unused)
gtcur->st = Ready;
p->st = Running;
old = &gtcur->ctx;
Expand Down Expand Up @@ -114,7 +108,7 @@ gtgo(void (*f)(void))
}


/* Now we test this nice library. */
/* Now, let's run some simple threaded code. */

void
f(void)
Expand All @@ -125,7 +119,7 @@ f(void)
id = ++x;
for (i = 0; i < 10; i++) {
printf("%d %d\n", id, i);
gtyield(true);
gtyield();
}
}

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4 changes: 2 additions & 2 deletions swtch.S → gtswtch.S
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,8 @@
# %rsi contains the context to switch to.
#

.code64
.globl gtswtch
.globl _gtswtch, gtswtch
_gtswtch:
gtswtch:

mov %rsp, 0x00(%rdi)
Expand Down