linux - TCP recv error! Connection reset by peer? -


why? didn't on other peer!

i using massive threads data server. when thread count small, it's ok. when thread count large, recv() return -1 , errno indicates "connection reset peer".

here example reproduce issue:

server.cc

#include <arpa/inet.h> #include <assert.h> #include <netinet/in.h> #include <pthread.h> #include <unistd.h>  char buffer[4096];  inline int send_all(int socket_fd, const char* data, size_t size, int flags) {     int result;     const char* pos = data;      while (size > 0)     {         result = send(socket_fd, pos, size, flags);         assert(result > 0);         pos += result;         size -= result;     }      return 0; }  inline int recv_all(int socket_fd, void* data, size_t size, int flags) {     int result = recv(socket_fd, data, size, flags | msg_waitall);     assert(((size_t) result) == size);     return 0; }  void* server_thread(void* arg) {     int socket_fd = (int) ((long) arg);     // recv info first     recv_all(socket_fd, buffer, 1, 0);      // simulate computation     (int = 0; < 0xffff; ++)         (int j = 0; j < 0xffff; j ++);      // send data     (int = 0; < 4096; ++)         send_all(socket_fd, buffer, sizeof(buffer), 0);      // peer closed, return 0     recv(socket_fd, buffer, 1, msg_waitall);     close(socket_fd);      pthread_detach(pthread_self());     return null; }  int main(void) {     int listen_socket = socket(af_inet, sock_stream, 0);     assert(listen_socket != -1);      struct sockaddr_in listen_address;     listen_address.sin_family = af_inet;     listen_address.sin_port = htons(11282);     listen_address.sin_addr.s_addr = inaddr_any;      int result = bind(listen_socket,             (struct sockaddr*) &listen_address,             sizeof(listen_address));     assert(result != -1);      result = listen(listen_socket, 5);     assert(result != -1);      while (true)     {         int server_socket = accept(listen_socket, null, null);         assert(server_socket != -1);          pthread_t tid;         result = pthread_create(&tid,                 null,                 server_thread,                 (void *) ((long) server_socket));         assert(result != -1);     }     return 0; }

client.cc

#include <arpa/inet.h> #include <assert.h> #include <netinet/in.h> #include <pthread.h> #include <stdlib.h> #include <unistd.h>  pthread_t threads[4096]; char buffer[4096];  inline int send_all(int socket_fd, const char* data, size_t size, int flags) {        int result;     const char* pos = data;      while (size > 0)     {            result = send(socket_fd, pos, size, flags);         assert(result > 0);          pos += result;         size -= result;     }        return 0; }     inline int recv_all(int socket_fd, void* data, size_t size, int flags) {        int result = recv(socket_fd, data, size, flags | msg_waitall);     assert(((size_t) result) == size);      return 0; }     void* client_thread(void* arg) {        int socket_fd = socket(af_inet, sock_stream, 0);      assert(socket_fd != -1);      struct sockaddr_in server_address;     server_address.sin_family = af_inet;     server_address.sin_port = htons(11282);     server_address.sin_addr.s_addr = inet_addr("127.0.0.1");      int result = connect(socket_fd,             (struct sockaddr *) &server_address,             sizeof(server_address));     assert(result != -1);      // send info first     send_all(socket_fd, buffer, 1, 0);      // recv reply data     (int = 0; < 4096; ++)         recv_all(socket_fd, buffer, sizeof(buffer), 0);      close(socket_fd);      return null; }  int main(int argc, char* argv[]) {     assert(argc == 2);      // client thread count     int thread_count = atoi(argv[1]);     assert(thread_count <= 4096);      (int = 0; < thread_count; ++)     {         int result = pthread_create(&threads[i], null, client_thread, null);         assert(result != -1);     }      (int = 0; < thread_count; ++)         pthread_join(threads[i], null);      return 0; }

usage:

./server ./client [thread_count]

i using 480 thread_count, sometime reproduce issue.

the server

the client

the gdb info


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