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fsm-health-win32: add polling framework to monitor daemon health

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Extend the Windows version of the "health" thread to periodically
inspect the system and shutdown if warranted.

This commit updates the thread's wait loop to use a timeout and
defines a (currently empty) table of functions to poll the system.

A later commit will add functions to the table to actually
inspect the system.

Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff Hostetler 2022-05-26 21:47:11 +00:00 committed by Junio C Hamano
parent d06055501b
commit 90a70fa809
1 changed files with 64 additions and 1 deletions
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65
compat/fsmonitor/fsm-health-win32.c
View File

@ -4,6 +4,24 @@
#include "fsm-health.h"
#include "fsmonitor--daemon.h"
/*
* Every minute wake up and test our health.
*/
#define WAIT_FREQ_MS (60 * 1000)
/*
* State machine states for each of the interval functions
* used for polling our health.
*/
enum interval_fn_ctx {
CTX_INIT = 0,
CTX_TERM,
CTX_TIMER
};
typedef int (interval_fn)(struct fsmonitor_daemon_state *state,
enum interval_fn_ctx ctx);
struct fsm_health_data
{
HANDLE hEventShutdown;
@ -42,18 +60,61 @@ void fsm_health__dtor(struct fsmonitor_daemon_state *state)
FREE_AND_NULL(state->health_data);
}
/*
* A table of the polling functions.
*/
static interval_fn *table[] = {
NULL, /* must be last */
};
/*
* Call all of the polling functions in the table.
* Shortcut and return first error.
*
* Return 0 if all succeeded.
*/
static int call_all(struct fsmonitor_daemon_state *state,
enum interval_fn_ctx ctx)
{
int k;
for (k = 0; table[k]; k++) {
int r = table[k](state, ctx);
if (r)
return r;
}
return 0;
}
void fsm_health__loop(struct fsmonitor_daemon_state *state)
{
struct fsm_health_data *data = state->health_data;
int r;
r = call_all(state, CTX_INIT);
if (r < 0)
goto force_error_stop;
if (r > 0)
goto force_shutdown;
for (;;) {
DWORD dwWait = WaitForMultipleObjects(data->nr_handles,
data->hHandles,
FALSE, INFINITE);
FALSE, WAIT_FREQ_MS);
if (dwWait == WAIT_OBJECT_0 + HEALTH_SHUTDOWN)
goto clean_shutdown;
if (dwWait == WAIT_TIMEOUT) {
r = call_all(state, CTX_TIMER);
if (r < 0)
goto force_error_stop;
if (r > 0)
goto force_shutdown;
continue;
}
error(_("health thread wait failed [GLE %ld]"),
GetLastError());
goto force_error_stop;
@ -61,8 +122,10 @@ void fsm_health__loop(struct fsmonitor_daemon_state *state)
force_error_stop:
state->health_error_code = -1;
force_shutdown:
ipc_server_stop_async(state->ipc_server_data);
clean_shutdown:
call_all(state, CTX_TERM);
return;
}