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bar: wait for all modules to have started up before continuing

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After starting all the module threads, wait for all modules to have
signalled "ready" before continuing.

This will allow modules to do initial setup, and knowing that
content() will *not* be called until they've signalled "ready".
This commit is contained in:
Daniel Eklöf 2018-12-19 19:41:25 +01:00
parent 7f0f096ba4
commit a3eb7ebc08
8 changed files with 35 additions and 1 deletions
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17
bar.c
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@ -10,6 +10,8 @@
#include <poll.h>
#include <signal.h>
#include <sys/eventfd.h>
#include <xcb/xcb.h>
#include <xcb/xcb_event.h>
#include <xcb/randr.h>
@ -383,10 +385,14 @@ run(struct bar_run_context *run_ctx)
struct module_run_context run_ctx_center[bar->center.count];
struct module_run_context run_ctx_right[bar->right.count];
int ready_fd = eventfd(0, EFD_SEMAPHORE);
assert(ready_fd != -1);
for (size_t i = 0; i < bar->left.count; i++) {
struct module_run_context *ctx = &run_ctx_left[i];
ctx->module = bar->left.mods[i];
ctx->ready_fd = ready_fd;
ctx->abort_fd = run_ctx->abort_fd;
thrd_create(&thrd_left[i], (int (*)(void *))bar->left.mods[i]->run, ctx);
@ -395,6 +401,7 @@ run(struct bar_run_context *run_ctx)
struct module_run_context *ctx = &run_ctx_center[i];
ctx->module = bar->center.mods[i];
ctx->ready_fd = ready_fd;
ctx->abort_fd = run_ctx->abort_fd;
thrd_create(&thrd_center[i], (int (*)(void *))bar->center.mods[i]->run, ctx);
@ -403,12 +410,20 @@ run(struct bar_run_context *run_ctx)
struct module_run_context *ctx = &run_ctx_right[i];
ctx->module = bar->right.mods[i];
ctx->ready_fd = ready_fd;
ctx->abort_fd = run_ctx->abort_fd;
thrd_create(&thrd_right[i], (int (*)(void *))bar->right.mods[i]->run, ctx);
}
LOG_DBG("modules started");
LOG_DBG("waiting for modules to become ready");
for (size_t i = 0; i < bar->left.count + bar->center.count + bar->right.count; i++) {
uint64_t b;
read(ready_fd, &b, sizeof(b));
}
close(ready_fd);
LOG_DBG("all modules started");
int fd = xcb_get_file_descriptor(bar->conn);