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utils: add a global tmpctx.

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I did a brief audit of tmpctx uses, and we do leak them in various
corner cases.  Fortunely, all our daemons are based on some kind of
I/O loop, so it's fairly easy to clean a global tmpctx at that point.

This makes things a bit neater, and slightly more efficient, but also
clearer: I avoided creating a tmpctx in a few places because I didn't
want to add another allocation.  With that penalty removed, I can use
it more freely and hopefully write clearer code.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
This commit is contained in:
Rusty Russell
2018-03-15 15:00:37 +10:30
parent 41ef42ee94
commit ef2a063169
10 changed files with 38 additions and 40 deletions
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37
common/utils.c
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@@ -4,6 +4,7 @@
#include <ccan/tal/str/str.h>
secp256k1_context *secp256k1_ctx;
const tal_t *tmpctx;
char *tal_hexstr(const tal_t *ctx, const void *data, size_t len)
{
@@ -25,36 +26,20 @@ u8 *tal_hexdata(const tal_t *ctx, const void *str, size_t len)
return data;
}
struct tmpctx {
struct list_node list;
const char *file;
unsigned int line;
};
/* Global temporary convenience context: freed in io loop core. */
static struct list_head tmpctxs = LIST_HEAD_INIT(tmpctxs);
static void destroy_tmpctx(struct tmpctx *t)
/* Initial creation of tmpctx. */
void setup_tmpctx(void)
{
list_del_from(&tmpctxs, &t->list);
tmpctx = tal(NULL, char);
}
tal_t *tal_tmpctx_(const tal_t *ctx, const char *file, unsigned int line)
/* Free any children of tmpctx. */
void clean_tmpctx(void)
{
struct tmpctx *t = tal(ctx, struct tmpctx);
t->file = file;
t->line = line;
list_add_tail(&tmpctxs, &t->list);
tal_add_destructor(t, destroy_tmpctx);
return t;
}
const char *tmpctx_any(void)
{
struct tmpctx *t = list_top(&tmpctxs, struct tmpctx, list);
if (t) {
assert(t->file != NULL);
return tal_fmt(t, "%s:%u", t->file, t->line);
/* Minor optimization: don't do anything if tmpctx unused. */
if (tal_first(tmpctx)) {
tal_free(tmpctx);
tmpctx = tal(NULL, char);
}
return NULL;
}