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add delayed output buffer

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This commit is contained in:
Daan Leijen 2019-10-11 17:03:09 -07:00
parent 46866330c1
commit 7d018dc9e1
1 changed files with 43 additions and 2 deletions
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45
src/options.c
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@ -140,6 +140,46 @@ static void mi_out_stderr(const char* msg) {
#endif
}
// Since an output function can be registered earliest in the `main`
// function we also buffer output that happens earlier. When
// an output function is registered it is called immediately with
// the output up to that point.
#define MAX_OUT_BUF (8*1024)
static char out_buf[MAX_OUT_BUF+1];
static _Atomic(uintptr_t) out_len;
static void mi_out_buf(const char* msg) {
if (msg==NULL) return;
size_t n = strlen(msg);
if (n==0) return;
// claim
if (mi_atomic_read_relaxed(&out_len)>=MAX_OUT_BUF) return;
uintptr_t start = mi_atomic_addu(&out_len, n);
if (start >= MAX_OUT_BUF) return;
// check bound
if (start+n >= MAX_OUT_BUF) {
n = MAX_OUT_BUF-start-1;
}
memcpy(&out_buf[start], msg, n);
}
static void mi_out_buf_contents(mi_output_fun* out) {
if (out==NULL) return;
// claim all
size_t count = mi_atomic_addu(&out_len, MAX_OUT_BUF);
// and output it
if (count>MAX_OUT_BUF) count = MAX_OUT_BUF;
out_buf[count] = 0;
out(out_buf);
}
// The initial default output outputs to stderr and the delayed buffer.
static void mi_out_buf_stderr(const char* msg) {
mi_out_stderr(msg);
mi_out_buf(msg);
}
// --------------------------------------------------------
// Default output handler
// --------------------------------------------------------
@ -151,11 +191,12 @@ static mi_output_fun* volatile mi_out_default; // = NULL
static mi_output_fun* mi_out_get_default(void) {
mi_output_fun* out = mi_out_default;
return (out == NULL ? &mi_out_stderr : out);
return (out == NULL ? &mi_out_buf_stderr : out);
}
void mi_register_output(mi_output_fun* out) mi_attr_noexcept {
mi_out_default = out;
mi_out_default = (out == NULL ? &mi_out_stderr : out);
if (out!=NULL) mi_out_buf_contents(out);
}