* [PATCH] io.c (io_fwrite): thread-local write buffer
@ 2016-12-29 0:44 Eric Wong
0 siblings, 0 replies; only message in thread
From: Eric Wong @ 2016-12-29 0:44 UTC (permalink / raw)
To: spew
worthless patch because rb_str_replace creates new frozen
object behind our back, so it doesn't save memory.
---
internal.h | 1 +
io.c | 14 ++++++++++----
thread.c | 11 +++++++++++
vm.c | 2 ++
vm_core.h | 1 +
5 files changed, 25 insertions(+), 4 deletions(-)
diff --git a/internal.h b/internal.h
index 2346345480..f90463030a 100644
--- a/internal.h
+++ b/internal.h
@@ -1521,6 +1521,7 @@ void rb_mutex_allow_trap(VALUE self, int val);
VALUE rb_uninterruptible(VALUE (*b_proc)(ANYARGS), VALUE data);
VALUE rb_mutex_owned_p(VALUE self);
void ruby_kill(rb_pid_t pid, int sig);
+VALUE rb_thread_iotmp(void);
/* thread_pthread.c, thread_win32.c */
void Init_native_thread(void);
diff --git a/io.c b/io.c
index 1074689560..02c6025ef0 100644
--- a/io.c
+++ b/io.c
@@ -1423,6 +1423,7 @@ static long
io_fwrite(VALUE str, rb_io_t *fptr, int nosync)
{
int converted = 0;
+ long w;
#ifdef _WIN32
if (fptr->mode & FMODE_TTY) {
long len = rb_w32_write_console(str, fptr->fd);
@@ -1431,12 +1432,17 @@ io_fwrite(VALUE str, rb_io_t *fptr, int nosync)
#endif
str = do_writeconv(str, fptr, &converted);
if (converted)
- OBJ_FREEZE(str);
- else
- str = rb_str_new_frozen(str);
+ RBASIC_CLEAR_CLASS(str);
+ else if (!OBJ_FROZEN(str))
+ str = rb_str_replace(rb_thread_iotmp(), str);
- return io_binwrite(str, RSTRING_PTR(str), RSTRING_LEN(str),
+ w = io_binwrite(str, RSTRING_PTR(str), RSTRING_LEN(str),
fptr, nosync);
+
+ if (!RBASIC_CLASS(str))
+ rb_str_resize(str, 0);
+
+ return w;
}
ssize_t
diff --git a/thread.c b/thread.c
index 71e479d38c..360b4c447f 100644
--- a/thread.c
+++ b/thread.c
@@ -2905,6 +2905,17 @@ rb_thread_getname(VALUE thread)
return th->name;
}
+VALUE
+rb_thread_iotmp(void)
+{
+ rb_thread_t *th = GET_THREAD();
+
+ if (!RTEST(th->iotmp)) {
+ th->iotmp = rb_str_tmp_new(0);
+ }
+ return th->iotmp;
+}
+
/*
* call-seq:
* thr.name=(name) -> string
diff --git a/vm.c b/vm.c
index b00a3e3505..66725090f4 100644
--- a/vm.c
+++ b/vm.c
@@ -2342,6 +2342,7 @@ rb_thread_mark(void *ptr)
}
RUBY_MARK_UNLESS_NULL(th->name);
+ RUBY_MARK_UNLESS_NULL(th->iotmp);
rb_vm_trace_mark_event_hooks(&th->event_hooks);
@@ -2474,6 +2475,7 @@ th_init(rb_thread_t *th, VALUE self)
th->retval = Qundef;
#endif
th->name = Qnil;
+ th->iotmp = Qnil;
}
static VALUE
diff --git a/vm_core.h b/vm_core.h
index ff5ff90a56..3916de8f1b 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -818,6 +818,7 @@ typedef struct rb_thread_struct {
#endif
unsigned long running_time_us;
VALUE name;
+ VALUE iotmp;
} rb_thread_t;
typedef enum {
--
EW
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