Remove grpc_use_signal which is no longer relevant

Author: vjpai

grpc.def

@@ -81,7 +81,6 @@ EXPORTS
     grpc_channelz_get_socket
     grpc_insecure_channel_create_from_fd
     grpc_server_add_insecure_channel_from_fd
-    grpc_use_signal
     grpc_auth_property_iterator_next
     grpc_auth_context_property_iterator
     grpc_auth_context_peer_identity

include/grpc/grpc_posix.h

@@ -52,14 +52,6 @@ GRPCAPI grpc_channel* grpc_insecure_channel_create_from_fd(
 GRPCAPI void grpc_server_add_insecure_channel_from_fd(grpc_server* server,
                                                       void* reserved, int fd);
 
-/** GRPC Core POSIX library may internally use signals to optimize some work.
-   The library uses (SIGRTMIN + 6) signal by default. Use this API to instruct
-   the library to use a different signal i.e 'signum' instead.
-   Note:
-   - To prevent GRPC library from using any signals, pass a 'signum' of -1
-   - This API is optional but if called, it MUST be called before grpc_init() */
-GRPCAPI void grpc_use_signal(int signum);
-
 #ifdef __cplusplus
 }
 #endif

src/core/lib/iomgr/ev_posix.cc

@@ -395,6 +395,4 @@ void grpc_pollset_set_del_fd(grpc_pollset_set* pollset_set, grpc_fd* fd) {
   g_event_engine->pollset_set_del_fd(pollset_set, fd);
 }
 
-void grpc_use_signal(int signum) {}
-
 #endif  // GRPC_POSIX_SOCKET_EV

src/ruby/ext/grpc/rb_grpc_imports.generated.c

@@ -104,7 +104,6 @@ grpc_channelz_get_subchannel_type grpc_channelz_get_subchannel_import;
 grpc_channelz_get_socket_type grpc_channelz_get_socket_import;
 grpc_insecure_channel_create_from_fd_type grpc_insecure_channel_create_from_fd_import;
 grpc_server_add_insecure_channel_from_fd_type grpc_server_add_insecure_channel_from_fd_import;
-grpc_use_signal_type grpc_use_signal_import;
 grpc_auth_property_iterator_next_type grpc_auth_property_iterator_next_import;
 grpc_auth_context_property_iterator_type grpc_auth_context_property_iterator_import;
 grpc_auth_context_peer_identity_type grpc_auth_context_peer_identity_import;
@@ -362,7 +361,6 @@ void grpc_rb_load_imports(HMODULE library) {
   grpc_channelz_get_socket_import = (grpc_channelz_get_socket_type) GetProcAddress(library, "grpc_channelz_get_socket");
   grpc_insecure_channel_create_from_fd_import = (grpc_insecure_channel_create_from_fd_type) GetProcAddress(library, "grpc_insecure_channel_create_from_fd");
   grpc_server_add_insecure_channel_from_fd_import = (grpc_server_add_insecure_channel_from_fd_type) GetProcAddress(library, "grpc_server_add_insecure_channel_from_fd");
-  grpc_use_signal_import = (grpc_use_signal_type) GetProcAddress(library, "grpc_use_signal");
   grpc_auth_property_iterator_next_import = (grpc_auth_property_iterator_next_type) GetProcAddress(library, "grpc_auth_property_iterator_next");
   grpc_auth_context_property_iterator_import = (grpc_auth_context_property_iterator_type) GetProcAddress(library, "grpc_auth_context_property_iterator");
   grpc_auth_context_peer_identity_import = (grpc_auth_context_peer_identity_type) GetProcAddress(library, "grpc_auth_context_peer_identity");

src/ruby/ext/grpc/rb_grpc_imports.generated.h

@@ -287,9 +287,6 @@ extern grpc_insecure_channel_create_from_fd_type grpc_insecure_channel_create_fr
 typedef void(*grpc_server_add_insecure_channel_from_fd_type)(grpc_server* server, void* reserved, int fd);
 extern grpc_server_add_insecure_channel_from_fd_type grpc_server_add_insecure_channel_from_fd_import;
 #define grpc_server_add_insecure_channel_from_fd grpc_server_add_insecure_channel_from_fd_import
-typedef void(*grpc_use_signal_type)(int signum);
-extern grpc_use_signal_type grpc_use_signal_import;
-#define grpc_use_signal grpc_use_signal_import
 typedef const grpc_auth_property*(*grpc_auth_property_iterator_next_type)(grpc_auth_property_iterator* it);
 extern grpc_auth_property_iterator_next_type grpc_auth_property_iterator_next_import;
 #define grpc_auth_property_iterator_next grpc_auth_property_iterator_next_import