diff options
Diffstat (limited to 'src/core/lib/iomgr/ev_posix.c')
-rw-r--r-- | src/core/lib/iomgr/ev_posix.c | 93 |
1 files changed, 87 insertions, 6 deletions
diff --git a/src/core/lib/iomgr/ev_posix.c b/src/core/lib/iomgr/ev_posix.c index 7df1751352..a7dfc9552d 100644 --- a/src/core/lib/iomgr/ev_posix.c +++ b/src/core/lib/iomgr/ev_posix.c @@ -37,23 +37,104 @@ #include "src/core/lib/iomgr/ev_posix.h" +#include <string.h> + +#include <grpc/support/alloc.h> #include <grpc/support/log.h> +#include <grpc/support/string_util.h> +#include <grpc/support/useful.h> #include "src/core/lib/iomgr/ev_poll_and_epoll_posix.h" +#include "src/core/lib/iomgr/ev_poll_posix.h" +#include "src/core/lib/support/env.h" + +/** Default poll() function - a pointer so that it can be overridden by some + * tests */ +grpc_poll_function_type grpc_poll_function = poll; static const grpc_event_engine_vtable *g_event_engine; -grpc_poll_function_type grpc_poll_function = poll; +typedef const grpc_event_engine_vtable *(*event_engine_factory_fn)(void); + +typedef struct { + const char *name; + event_engine_factory_fn factory; +} event_engine_factory; + +static const event_engine_factory g_factories[] = { + {"poll", grpc_init_poll_posix}, {"legacy", grpc_init_poll_and_epoll_posix}, +}; + +static void add(const char *beg, const char *end, char ***ss, size_t *ns) { + size_t n = *ns; + size_t np = n + 1; + char *s; + size_t len; + GPR_ASSERT(end >= beg); + len = (size_t)(end - beg); + s = gpr_malloc(len + 1); + memcpy(s, beg, len); + s[len] = 0; + *ss = gpr_realloc(*ss, sizeof(char **) * np); + (*ss)[n] = s; + *ns = np; +} + +static void split(const char *s, char ***ss, size_t *ns) { + const char *c = strchr(s, ','); + if (c == NULL) { + add(s, s + strlen(s), ss, ns); + } else { + add(s, c, ss, ns); + split(c + 1, ss, ns); + } +} + +static bool is(const char *want, const char *have) { + return 0 == strcmp(want, "all") || 0 == strcmp(want, have); +} + +static void try_engine(const char *engine) { + for (size_t i = 0; i < GPR_ARRAY_SIZE(g_factories); i++) { + if (is(engine, g_factories[i].name)) { + if ((g_event_engine = g_factories[i].factory())) { + gpr_log(GPR_DEBUG, "Using polling engine: %s", g_factories[i].name); + return; + } + } + } +} void grpc_event_engine_init(void) { - if ((g_event_engine = grpc_init_poll_and_epoll_posix())) { - return; + char *s = gpr_getenv("GRPC_POLL_STRATEGY"); + if (s == NULL) { + s = gpr_strdup("all"); + } + + char **strings = NULL; + size_t nstrings = 0; + split(s, &strings, &nstrings); + + for (size_t i = 0; g_event_engine == NULL && i < nstrings; i++) { + try_engine(strings[i]); + } + + for (size_t i = 0; i < nstrings; i++) { + gpr_free(strings[i]); + } + gpr_free(strings); + gpr_free(s); + + if (g_event_engine == NULL) { + gpr_log(GPR_ERROR, "No event engine could be initialized"); + abort(); } - gpr_log(GPR_ERROR, "No event engine could be initialized"); - abort(); } -void grpc_event_engine_shutdown(void) { g_event_engine->shutdown_engine(); } +void grpc_event_engine_shutdown(void) { + g_event_engine->shutdown_engine(); + g_event_engine = NULL; +} grpc_fd *grpc_fd_create(int fd, const char *name) { return g_event_engine->fd_create(fd, name); |