src/core/iomgr/pollset_windows.c

/*
 *
 * Copyright 2015, Google Inc.
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 * modification, are permitted provided that the following conditions are
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 *
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 * notice, this list of conditions and the following disclaimer.
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 * in the documentation and/or other materials provided with the
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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#include <grpc/support/port_platform.h>

#ifdef GPR_WINSOCK_SOCKET

#include <grpc/support/thd.h>

#include "src/core/iomgr/alarm_internal.h"
#include "src/core/iomgr/iomgr_internal.h"
#include "src/core/iomgr/pollset.h"
#include "src/core/iomgr/pollset_windows.h"

/* There isn't really any such thing as a pollset under Windows, due to the
   nature of the IO completion ports. We're still going to provide a minimal
   set of features for the sake of the rest of grpc. But grpc_pollset_work
   won't actually do any polling, and return as quickly as possible. */

void grpc_pollset_init(grpc_pollset *pollset) {
  memset(pollset, 0, sizeof(*pollset));
  gpr_mu_init(&pollset->mu);
  gpr_cv_init(&pollset->cv);
}

void grpc_pollset_shutdown(grpc_pollset *pollset,
                           void (*shutdown_done)(void *arg),
                           void *shutdown_done_arg) {
  gpr_mu_lock(&pollset->mu);
  pollset->shutting_down = 1;
  gpr_cv_broadcast(&pollset->cv);
  gpr_mu_unlock(&pollset->mu);
  shutdown_done(shutdown_done_arg);
}

void grpc_pollset_destroy(grpc_pollset *pollset) {
  gpr_mu_destroy(&pollset->mu);
  gpr_cv_destroy(&pollset->cv);
}

int grpc_pollset_work(grpc_pollset *pollset, gpr_timespec deadline) {
  gpr_timespec now;
  now = gpr_now();
  if (gpr_time_cmp(now, deadline) > 0) {
    return 0 /* GPR_FALSE */;
  }
  if (grpc_maybe_call_delayed_callbacks(&pollset->mu, 1 /* GPR_TRUE */)) {
    return 1 /* GPR_TRUE */;
  }
  if (grpc_alarm_check(&pollset->mu, now, &deadline)) {
    return 1 /* GPR_TRUE */;
  }
  if (!pollset->shutting_down) {
    gpr_cv_wait(&pollset->cv, &pollset->mu, deadline);
  }
  return 1 /* GPR_TRUE */;
}

void grpc_pollset_kick(grpc_pollset *p) {
  gpr_cv_signal(&p->cv);
}

#endif /* GPR_WINSOCK_SOCKET */