mirror of https://github.com/grpc/grpc.git
Craig Tiller
8 years ago
parent
15fda75e1c
commit
c67cc999e3
27 changed files with 771 additions and 62 deletions
@ -0,0 +1,579 @@ |
||||
/*
|
||||
* |
||||
* Copyright 2016, Google Inc. |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or without |
||||
* modification, are permitted provided that the following conditions are |
||||
* met: |
||||
* |
||||
* * Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* * Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following disclaimer |
||||
* in the documentation and/or other materials provided with the |
||||
* distribution. |
||||
* * Neither the name of Google Inc. nor the names of its |
||||
* contributors may be used to endorse or promote products derived from |
||||
* this software without specific prior written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
* |
||||
*/ |
||||
|
||||
#include "src/core/lib/iomgr/port.h" |
||||
|
||||
/* This polling engine is only relevant on linux kernels supporting epoll() */ |
||||
#ifdef GRPC_LINUX_EPOLL |
||||
|
||||
#include "src/core/lib/iomgr/ev_epoll_linux.h" |
||||
|
||||
#include <assert.h> |
||||
#include <errno.h> |
||||
#include <poll.h> |
||||
#include <pthread.h> |
||||
#include <string.h> |
||||
#include <sys/epoll.h> |
||||
#include <sys/socket.h> |
||||
#include <unistd.h> |
||||
|
||||
#include <grpc/support/alloc.h> |
||||
#include <grpc/support/log.h> |
||||
#include <grpc/support/string_util.h> |
||||
#include <grpc/support/tls.h> |
||||
#include <grpc/support/useful.h> |
||||
|
||||
#include "src/core/lib/iomgr/ev_posix.h" |
||||
#include "src/core/lib/iomgr/iomgr_internal.h" |
||||
#include "src/core/lib/iomgr/lockfree_event.h" |
||||
#include "src/core/lib/iomgr/timer.h" |
||||
#include "src/core/lib/iomgr/wakeup_fd_posix.h" |
||||
#include "src/core/lib/iomgr/workqueue.h" |
||||
#include "src/core/lib/profiling/timers.h" |
||||
#include "src/core/lib/support/block_annotate.h" |
||||
|
||||
/* TODO: sreek: Right now, this wakes up all pollers. In future we should make
|
||||
* sure to wake up one polling thread (which can wake up other threads if |
||||
* needed) */ |
||||
static grpc_wakeup_fd global_wakeup_fd; |
||||
static int g_epfd; |
||||
|
||||
/*******************************************************************************
|
||||
* Fd Declarations |
||||
*/ |
||||
|
||||
struct grpc_fd { |
||||
int fd; |
||||
|
||||
/* The fd is either closed or we relinquished control of it. In either
|
||||
cases, this indicates that the 'fd' on this structure is no longer |
||||
valid */ |
||||
bool orphaned; |
||||
|
||||
gpr_atm read_closure; |
||||
gpr_atm write_closure; |
||||
|
||||
struct grpc_fd *freelist_next; |
||||
grpc_closure *on_done_closure; |
||||
|
||||
/* The pollset that last noticed that the fd is readable. The actual type
|
||||
* stored in this is (grpc_pollset *) */ |
||||
gpr_atm read_notifier_pollset; |
||||
|
||||
grpc_iomgr_object iomgr_object; |
||||
}; |
||||
|
||||
static void fd_global_init(void); |
||||
static void fd_global_shutdown(void); |
||||
|
||||
/*******************************************************************************
|
||||
* Pollset Declarations |
||||
*/ |
||||
|
||||
typedef struct pollset_worker_link { |
||||
grpc_pollset_worker *next; |
||||
grpc_pollset_worker *prev; |
||||
} pollset_worker_link; |
||||
|
||||
typedef enum { |
||||
PWL_POLLSET, |
||||
PWL_POLLABLE, |
||||
POLLSET_WORKER_LINK_COUNT |
||||
} pollset_worker_links; |
||||
|
||||
struct grpc_pollset_worker { |
||||
bool kicked; |
||||
bool initialized_cv; |
||||
pollset_worker_link links[POLLSET_WORKER_LINK_COUNT]; |
||||
gpr_cv cv; |
||||
}; |
||||
|
||||
struct grpc_pollset { |
||||
grpc_pollset_worker root_worker; |
||||
bool kicked_without_pollers; |
||||
|
||||
bool shutting_down; /* Is the pollset shutting down ? */ |
||||
bool finish_shutdown_called; /* Is the 'finish_shutdown_locked()' called ? */ |
||||
grpc_closure *shutdown_done; /* Called after after shutdown is complete */ |
||||
}; |
||||
|
||||
/*******************************************************************************
|
||||
* Pollset-set Declarations |
||||
*/ |
||||
struct grpc_pollset_set {}; |
||||
|
||||
/*******************************************************************************
|
||||
* Common helpers |
||||
*/ |
||||
|
||||
static bool append_error(grpc_error **composite, grpc_error *error, |
||||
const char *desc) { |
||||
if (error == GRPC_ERROR_NONE) return true; |
||||
if (*composite == GRPC_ERROR_NONE) { |
||||
*composite = GRPC_ERROR_CREATE_FROM_COPIED_STRING(desc); |
||||
} |
||||
*composite = grpc_error_add_child(*composite, error); |
||||
return false; |
||||
} |
||||
|
||||
/*******************************************************************************
|
||||
* Fd Definitions |
||||
*/ |
||||
|
||||
/* We need to keep a freelist not because of any concerns of malloc performance
|
||||
* but instead so that implementations with multiple threads in (for example) |
||||
* epoll_wait deal with the race between pollset removal and incoming poll |
||||
* notifications. |
||||
* |
||||
* The problem is that the poller ultimately holds a reference to this |
||||
* object, so it is very difficult to know when is safe to free it, at least |
||||
* without some expensive synchronization. |
||||
* |
||||
* If we keep the object freelisted, in the worst case losing this race just |
||||
* becomes a spurious read notification on a reused fd. |
||||
*/ |
||||
|
||||
/* The alarm system needs to be able to wakeup 'some poller' sometimes
|
||||
* (specifically when a new alarm needs to be triggered earlier than the next |
||||
* alarm 'epoch'). This wakeup_fd gives us something to alert on when such a |
||||
* case occurs. */ |
||||
|
||||
static grpc_fd *fd_freelist = NULL; |
||||
static gpr_mu fd_freelist_mu; |
||||
|
||||
#ifdef GRPC_FD_REF_COUNT_DEBUG |
||||
#define REF_BY(fd, n, reason) ref_by(fd, n, reason, __FILE__, __LINE__) |
||||
#define UNREF_BY(fd, n, reason) unref_by(fd, n, reason, __FILE__, __LINE__) |
||||
static void ref_by(grpc_fd *fd, int n, const char *reason, const char *file, |
||||
int line) { |
||||
gpr_log(GPR_DEBUG, "FD %d %p ref %d %ld -> %ld [%s; %s:%d]", fd->fd, |
||||
(void *)fd, n, gpr_atm_no_barrier_load(&fd->refst), |
||||
gpr_atm_no_barrier_load(&fd->refst) + n, reason, file, line); |
||||
#else |
||||
#define REF_BY(fd, n, reason) ref_by(fd, n) |
||||
#define UNREF_BY(fd, n, reason) unref_by(fd, n) |
||||
static void ref_by(grpc_fd *fd, int n) { |
||||
#endif |
||||
GPR_ASSERT(gpr_atm_no_barrier_fetch_add(&fd->refst, n) > 0); |
||||
} |
||||
|
||||
#ifdef GRPC_FD_REF_COUNT_DEBUG |
||||
static void unref_by(grpc_fd *fd, int n, const char *reason, const char *file, |
||||
int line) { |
||||
gpr_atm old; |
||||
gpr_log(GPR_DEBUG, "FD %d %p unref %d %ld -> %ld [%s; %s:%d]", fd->fd, |
||||
(void *)fd, n, gpr_atm_no_barrier_load(&fd->refst), |
||||
gpr_atm_no_barrier_load(&fd->refst) - n, reason, file, line); |
||||
#else |
||||
static void unref_by(grpc_fd *fd, int n) { |
||||
gpr_atm old; |
||||
#endif |
||||
old = gpr_atm_full_fetch_add(&fd->refst, -n); |
||||
if (old == n) { |
||||
/* Add the fd to the freelist */ |
||||
gpr_mu_lock(&fd_freelist_mu); |
||||
fd->freelist_next = fd_freelist; |
||||
fd_freelist = fd; |
||||
grpc_iomgr_unregister_object(&fd->iomgr_object); |
||||
|
||||
grpc_lfev_destroy(&fd->read_closure); |
||||
grpc_lfev_destroy(&fd->write_closure); |
||||
|
||||
gpr_mu_unlock(&fd_freelist_mu); |
||||
} else { |
||||
GPR_ASSERT(old > n); |
||||
} |
||||
} |
||||
|
||||
/* Increment refcount by two to avoid changing the orphan bit */ |
||||
#ifdef GRPC_FD_REF_COUNT_DEBUG |
||||
static void fd_ref(grpc_fd *fd, const char *reason, const char *file, |
||||
int line) { |
||||
ref_by(fd, 2, reason, file, line); |
||||
} |
||||
|
||||
static void fd_unref(grpc_fd *fd, const char *reason, const char *file, |
||||
int line) { |
||||
unref_by(fd, 2, reason, file, line); |
||||
} |
||||
#else |
||||
static void fd_ref(grpc_fd *fd) { ref_by(fd, 2); } |
||||
static void fd_unref(grpc_fd *fd) { unref_by(fd, 2); } |
||||
#endif |
||||
|
||||
static void fd_global_init(void) { gpr_mu_init(&fd_freelist_mu); } |
||||
|
||||
static void fd_global_shutdown(void) { |
||||
gpr_mu_lock(&fd_freelist_mu); |
||||
gpr_mu_unlock(&fd_freelist_mu); |
||||
while (fd_freelist != NULL) { |
||||
grpc_fd *fd = fd_freelist; |
||||
fd_freelist = fd_freelist->freelist_next; |
||||
gpr_mu_destroy(&fd->po.mu); |
||||
gpr_free(fd); |
||||
} |
||||
gpr_mu_destroy(&fd_freelist_mu); |
||||
} |
||||
|
||||
static grpc_fd *fd_create(int fd, const char *name) { |
||||
grpc_fd *new_fd = NULL; |
||||
|
||||
gpr_mu_lock(&fd_freelist_mu); |
||||
if (fd_freelist != NULL) { |
||||
new_fd = fd_freelist; |
||||
fd_freelist = fd_freelist->freelist_next; |
||||
} |
||||
gpr_mu_unlock(&fd_freelist_mu); |
||||
|
||||
if (new_fd == NULL) { |
||||
new_fd = gpr_malloc(sizeof(grpc_fd)); |
||||
gpr_mu_init(&new_fd->po.mu); |
||||
} |
||||
|
||||
/* Note: It is not really needed to get the new_fd->po.mu lock here. If this
|
||||
* is a newly created fd (or an fd we got from the freelist), no one else |
||||
* would be holding a lock to it anyway. */ |
||||
gpr_mu_lock(&new_fd->po.mu); |
||||
new_fd->po.pi = NULL; |
||||
#ifdef PO_DEBUG |
||||
new_fd->po.obj_type = POLL_OBJ_FD; |
||||
#endif |
||||
|
||||
gpr_atm_rel_store(&new_fd->refst, (gpr_atm)1); |
||||
new_fd->fd = fd; |
||||
new_fd->orphaned = false; |
||||
grpc_lfev_init(&new_fd->read_closure); |
||||
grpc_lfev_init(&new_fd->write_closure); |
||||
gpr_atm_no_barrier_store(&new_fd->read_notifier_pollset, (gpr_atm)NULL); |
||||
|
||||
new_fd->freelist_next = NULL; |
||||
new_fd->on_done_closure = NULL; |
||||
|
||||
gpr_mu_unlock(&new_fd->po.mu); |
||||
|
||||
char *fd_name; |
||||
gpr_asprintf(&fd_name, "%s fd=%d", name, fd); |
||||
grpc_iomgr_register_object(&new_fd->iomgr_object, fd_name); |
||||
#ifdef GRPC_FD_REF_COUNT_DEBUG |
||||
gpr_log(GPR_DEBUG, "FD %d %p create %s", fd, (void *)new_fd, fd_name); |
||||
#endif |
||||
gpr_free(fd_name); |
||||
return new_fd; |
||||
} |
||||
|
||||
static int fd_wrapped_fd(grpc_fd *fd) { |
||||
int ret_fd = -1; |
||||
gpr_mu_lock(&fd->po.mu); |
||||
if (!fd->orphaned) { |
||||
ret_fd = fd->fd; |
||||
} |
||||
gpr_mu_unlock(&fd->po.mu); |
||||
|
||||
return ret_fd; |
||||
} |
||||
|
||||
static void fd_orphan(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
||||
grpc_closure *on_done, int *release_fd, |
||||
const char *reason) { |
||||
bool is_fd_closed = false; |
||||
grpc_error *error = GRPC_ERROR_NONE; |
||||
polling_island *unref_pi = NULL; |
||||
|
||||
gpr_mu_lock(&fd->po.mu); |
||||
fd->on_done_closure = on_done; |
||||
|
||||
/* If release_fd is not NULL, we should be relinquishing control of the file
|
||||
descriptor fd->fd (but we still own the grpc_fd structure). */ |
||||
if (release_fd != NULL) { |
||||
*release_fd = fd->fd; |
||||
} else { |
||||
close(fd->fd); |
||||
is_fd_closed = true; |
||||
} |
||||
|
||||
fd->orphaned = true; |
||||
|
||||
/* Remove the active status but keep referenced. We want this grpc_fd struct
|
||||
to be alive (and not added to freelist) until the end of this function */ |
||||
REF_BY(fd, 1, reason); |
||||
|
||||
/* Remove the fd from the polling island:
|
||||
- Get a lock on the latest polling island (i.e the last island in the |
||||
linked list pointed by fd->po.pi). This is the island that |
||||
would actually contain the fd |
||||
- Remove the fd from the latest polling island |
||||
- Unlock the latest polling island |
||||
- Set fd->po.pi to NULL (but remove the ref on the polling island |
||||
before doing this.) */ |
||||
if (fd->po.pi != NULL) { |
||||
polling_island *pi_latest = polling_island_lock(fd->po.pi); |
||||
polling_island_remove_fd_locked(pi_latest, fd, is_fd_closed, &error); |
||||
gpr_mu_unlock(&pi_latest->mu); |
||||
|
||||
unref_pi = fd->po.pi; |
||||
fd->po.pi = NULL; |
||||
} |
||||
|
||||
grpc_closure_sched(exec_ctx, fd->on_done_closure, GRPC_ERROR_REF(error)); |
||||
|
||||
gpr_mu_unlock(&fd->po.mu); |
||||
UNREF_BY(fd, 2, reason); /* Drop the reference */ |
||||
if (unref_pi != NULL) { |
||||
/* Unref stale polling island here, outside the fd lock above.
|
||||
The polling island owns a workqueue which owns an fd, and unreffing |
||||
inside the lock can cause an eventual lock loop that makes TSAN very |
||||
unhappy. */ |
||||
PI_UNREF(exec_ctx, unref_pi, "fd_orphan"); |
||||
} |
||||
GRPC_LOG_IF_ERROR("fd_orphan", GRPC_ERROR_REF(error)); |
||||
GRPC_ERROR_UNREF(error); |
||||
} |
||||
|
||||
static grpc_pollset *fd_get_read_notifier_pollset(grpc_exec_ctx *exec_ctx, |
||||
grpc_fd *fd) { |
||||
gpr_atm notifier = gpr_atm_acq_load(&fd->read_notifier_pollset); |
||||
return (grpc_pollset *)notifier; |
||||
} |
||||
|
||||
static bool fd_is_shutdown(grpc_fd *fd) { |
||||
return grpc_lfev_is_shutdown(&fd->read_closure); |
||||
} |
||||
|
||||
/* Might be called multiple times */ |
||||
static void fd_shutdown(grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_error *why) { |
||||
if (grpc_lfev_set_shutdown(exec_ctx, &fd->read_closure, |
||||
GRPC_ERROR_REF(why))) { |
||||
shutdown(fd->fd, SHUT_RDWR); |
||||
grpc_lfev_set_shutdown(exec_ctx, &fd->write_closure, GRPC_ERROR_REF(why)); |
||||
} |
||||
GRPC_ERROR_UNREF(why); |
||||
} |
||||
|
||||
static void fd_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
||||
grpc_closure *closure) { |
||||
grpc_lfev_notify_on(exec_ctx, &fd->read_closure, closure); |
||||
} |
||||
|
||||
static void fd_notify_on_write(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
||||
grpc_closure *closure) { |
||||
grpc_lfev_notify_on(exec_ctx, &fd->write_closure, closure); |
||||
} |
||||
|
||||
static grpc_workqueue *fd_get_workqueue(grpc_fd *fd) { |
||||
gpr_mu_lock(&fd->po.mu); |
||||
grpc_workqueue *workqueue = |
||||
GRPC_WORKQUEUE_REF((grpc_workqueue *)fd->po.pi, "fd_get_workqueue"); |
||||
gpr_mu_unlock(&fd->po.mu); |
||||
return workqueue; |
||||
} |
||||
|
||||
/*******************************************************************************
|
||||
* Pollset Definitions |
||||
*/ |
||||
|
||||
/* Return true if first in list */ |
||||
static bool worker_insert(grpc_pollset_worker **root, pollset_worker_links link, |
||||
grpc_pollset_worker *worker) { |
||||
if (*root == NULL) { |
||||
*root = worker; |
||||
worker->links[link].next = worker->links[link].prev = worker; |
||||
return true; |
||||
} else { |
||||
worker->links[link].next = *root; |
||||
worker->links[link].prev = worker->links[link].next->links[link].prev; |
||||
worker->links[link].next->links[link].prev = worker; |
||||
worker->links[link].prev->links[link].next = worker; |
||||
return false; |
||||
} |
||||
} |
||||
|
||||
/* Return true if last in list */ |
||||
typedef enum { EMPTIED, NEW_ROOT, REMOVED } worker_remove_result; |
||||
|
||||
static worker_remove_result worker_remove(grpc_pollset_worker **root, |
||||
pollset_worker_links link, |
||||
grpc_pollset_worker *worker) { |
||||
if (worker == *root) { |
||||
if (worker == worker->links[link].next) { |
||||
*root = NULL; |
||||
return EMPTIED; |
||||
} else { |
||||
*root = worker->links[link].next; |
||||
worker->links[link].prev->links[link].next = worker->links[link].next; |
||||
worker->links[link].next->links[link].prev = worker->links[link].prev; |
||||
return NEW_ROOT; |
||||
} |
||||
} else { |
||||
worker->links[link].prev->links[link].next = worker->links[link].next; |
||||
worker->links[link].next->links[link].prev = worker->links[link].prev; |
||||
return REMOVED; |
||||
} |
||||
} |
||||
|
||||
GPR_TLS_DECL(g_current_thread_pollset); |
||||
GPR_TLS_DECL(g_current_thread_worker); |
||||
|
||||
/*******************************************************************************
|
||||
* Pollset-set Definitions |
||||
*/ |
||||
|
||||
static grpc_pollset_set *pollset_set_create(void) { |
||||
return (grpc_pollset_set *)((intptr_t)0xdeafbeef); |
||||
} |
||||
|
||||
static void pollset_set_destroy(grpc_exec_ctx *exec_ctx, |
||||
grpc_pollset_set *pss) {} |
||||
|
||||
static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
||||
grpc_fd *fd) {} |
||||
|
||||
static void pollset_set_del_fd(grpc_exec_ctx *exec_ctx, grpc_pollset_set *pss, |
||||
grpc_fd *fd) {} |
||||
|
||||
static void pollset_set_add_pollset(grpc_exec_ctx *exec_ctx, |
||||
grpc_pollset_set *pss, grpc_pollset *ps) {} |
||||
|
||||
static void pollset_set_del_pollset(grpc_exec_ctx *exec_ctx, |
||||
grpc_pollset_set *pss, grpc_pollset *ps) {} |
||||
|
||||
static void pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx, |
||||
grpc_pollset_set *bag, |
||||
grpc_pollset_set *item) {} |
||||
|
||||
static void pollset_set_del_pollset_set(grpc_exec_ctx *exec_ctx, |
||||
grpc_pollset_set *bag, |
||||
grpc_pollset_set *item) {} |
||||
|
||||
/*******************************************************************************
|
||||
* Event engine binding |
||||
*/ |
||||
|
||||
static void shutdown_engine(void) { |
||||
fd_global_shutdown(); |
||||
pollset_global_shutdown(); |
||||
polling_island_global_shutdown(); |
||||
} |
||||
|
||||
static const grpc_event_engine_vtable vtable = { |
||||
.pollset_size = sizeof(grpc_pollset), |
||||
|
||||
.fd_create = fd_create, |
||||
.fd_wrapped_fd = fd_wrapped_fd, |
||||
.fd_orphan = fd_orphan, |
||||
.fd_shutdown = fd_shutdown, |
||||
.fd_is_shutdown = fd_is_shutdown, |
||||
.fd_notify_on_read = fd_notify_on_read, |
||||
.fd_notify_on_write = fd_notify_on_write, |
||||
.fd_get_read_notifier_pollset = fd_get_read_notifier_pollset, |
||||
.fd_get_workqueue = fd_get_workqueue, |
||||
|
||||
.pollset_init = pollset_init, |
||||
.pollset_shutdown = pollset_shutdown, |
||||
.pollset_destroy = pollset_destroy, |
||||
.pollset_work = pollset_work, |
||||
.pollset_kick = pollset_kick, |
||||
.pollset_add_fd = pollset_add_fd, |
||||
|
||||
.pollset_set_create = pollset_set_create, |
||||
.pollset_set_destroy = pollset_set_destroy, |
||||
.pollset_set_add_pollset = pollset_set_add_pollset, |
||||
.pollset_set_del_pollset = pollset_set_del_pollset, |
||||
.pollset_set_add_pollset_set = pollset_set_add_pollset_set, |
||||
.pollset_set_del_pollset_set = pollset_set_del_pollset_set, |
||||
.pollset_set_add_fd = pollset_set_add_fd, |
||||
.pollset_set_del_fd = pollset_set_del_fd, |
||||
|
||||
.kick_poller = kick_poller, |
||||
|
||||
.workqueue_ref = workqueue_ref, |
||||
.workqueue_unref = workqueue_unref, |
||||
.workqueue_scheduler = workqueue_scheduler, |
||||
|
||||
.shutdown_engine = shutdown_engine, |
||||
}; |
||||
|
||||
/* It is possible that GLIBC has epoll but the underlying kernel doesn't.
|
||||
* Create a dummy epoll_fd to make sure epoll support is available */ |
||||
static bool is_epoll_available() { |
||||
int fd = epoll_create1(EPOLL_CLOEXEC); |
||||
if (fd < 0) { |
||||
gpr_log( |
||||
GPR_ERROR, |
||||
"epoll_create1 failed with error: %d. Not using epoll polling engine", |
||||
fd); |
||||
return false; |
||||
} |
||||
close(fd); |
||||
return true; |
||||
} |
||||
|
||||
const grpc_event_engine_vtable *grpc_init_epoll1_linux(void) { |
||||
/* If use of signals is disabled, we cannot use epoll engine*/ |
||||
if (is_grpc_wakeup_signal_initialized && grpc_wakeup_signal < 0) { |
||||
return NULL; |
||||
} |
||||
|
||||
if (!grpc_has_wakeup_fd()) { |
||||
return NULL; |
||||
} |
||||
|
||||
if (!is_epoll_available()) { |
||||
return NULL; |
||||
} |
||||
|
||||
if (!is_grpc_wakeup_signal_initialized) { |
||||
grpc_use_signal(SIGRTMIN + 6); |
||||
} |
||||
|
||||
fd_global_init(); |
||||
|
||||
if (!GRPC_LOG_IF_ERROR("pollset_global_init", pollset_global_init())) { |
||||
return NULL; |
||||
} |
||||
|
||||
if (!GRPC_LOG_IF_ERROR("polling_island_global_init", |
||||
polling_island_global_init())) { |
||||
return NULL; |
||||
} |
||||
|
||||
return &vtable; |
||||
} |
||||
|
||||
#else /* defined(GRPC_LINUX_EPOLL) */ |
||||
#if defined(GRPC_POSIX_SOCKET) |
||||
#include "src/core/lib/iomgr/ev_posix.h" |
||||
/* If GRPC_LINUX_EPOLL is not defined, it means epoll is not available. Return
|
||||
* NULL */ |
||||
const grpc_event_engine_vtable *grpc_init_epoll1_linux(void) { return NULL; } |
||||
#endif /* defined(GRPC_POSIX_SOCKET) */ |
||||
#endif /* !defined(GRPC_LINUX_EPOLL) */ |
||||
@ -0,0 +1,50 @@ |
||||
/*
|
||||
* |
||||
* Copyright 2015, Google Inc. |
||||
* All rights reserved. |
||||
* |
||||
* Redistribution and use in source and binary forms, with or without |
||||
* modification, are permitted provided that the following conditions are |
||||
* met: |
||||
* |
||||
* * Redistributions of source code must retain the above copyright |
||||
* notice, this list of conditions and the following disclaimer. |
||||
* * Redistributions in binary form must reproduce the above |
||||
* copyright notice, this list of conditions and the following disclaimer |
||||
* in the documentation and/or other materials provided with the |
||||
* distribution. |
||||
* * Neither the name of Google Inc. nor the names of its |
||||
* contributors may be used to endorse or promote products derived from |
||||
* this software without specific prior written permission. |
||||
* |
||||
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
||||
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
||||
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
||||
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
||||
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
||||
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
||||
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
||||
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
||||
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
||||
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
||||
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
||||
* |
||||
*/ |
||||
|
||||
#ifndef GRPC_CORE_LIB_IOMGR_EV_EPOLL1_LINUX_H |
||||
#define GRPC_CORE_LIB_IOMGR_EV_EPOLL1_LINUX_H |
||||
|
||||
#include "src/core/lib/iomgr/ev_posix.h" |
||||
#include "src/core/lib/iomgr/port.h" |
||||
|
||||
// a polling engine that utilizes a singleton epoll set and turnstile polling
|
||||
|
||||
const grpc_event_engine_vtable *grpc_init_epoll1_linux(void); |
||||
|
||||
#ifdef GRPC_LINUX_EPOLL |
||||
void *grpc_fd_get_polling_island(grpc_fd *fd); |
||||
void *grpc_pollset_get_polling_island(grpc_pollset *ps); |
||||
bool grpc_are_polling_islands_equal(void *p, void *q); |
||||
#endif /* defined(GRPC_LINUX_EPOLL) */ |
||||
|
||||
#endif /* GRPC_CORE_LIB_IOMGR_EV_EPOLL1_LINUX_H */ |
||||
Loading…
Reference in new issue