lib/eal/windows/eal_thread.c

   1 /* SPDX-License-Identifier: BSD-3-Clause
   2  * Copyright(c) 2019 Intel Corporation
   3  */
   4
   5 #include <io.h>
   6
   7 #include <rte_atomic.h>
   8 #include <rte_debug.h>
   9 #include <rte_launch.h>
  10 #include <rte_lcore.h>
  11 #include <rte_per_lcore.h>
  12 #include <rte_common.h>
  13 #include <rte_memory.h>
  14 #include <eal_thread.h>
  15
  16 #include "eal_private.h"
  17 #include "eal_windows.h"
  18
  19 /*
  20  * Send a message to a worker lcore identified by worker_id to call a
  21  * function f with argument arg. Once the execution is done, the
  22  * remote lcore switch in FINISHED state.
  23  */
  24 int
  25 rte_eal_remote_launch(lcore_function_t *f, void *arg, unsigned int worker_id)
  26 {
  27         int n;
  28         char c = 0;
  29         int m2w = lcore_config[worker_id].pipe_main2worker[1];
  30         int w2m = lcore_config[worker_id].pipe_worker2main[0];
  31
  32         if (lcore_config[worker_id].state != WAIT)
  33                 return -EBUSY;
  34
  35         lcore_config[worker_id].f = f;
  36         lcore_config[worker_id].arg = arg;
  37
  38         /* send message */
  39         n = 0;
  40         while (n == 0 || (n < 0 && errno == EINTR))
  41                 n = _write(m2w, &c, 1);
  42         if (n < 0)
  43                 rte_panic("cannot write on configuration pipe\n");
  44
  45         /* wait ack */
  46         do {
  47                 n = _read(w2m, &c, 1);
  48         } while (n < 0 && errno == EINTR);
  49
  50         if (n <= 0)
  51                 rte_panic("cannot read on configuration pipe\n");
  52
  53         return 0;
  54 }
  55
  56 /* main loop of threads */
  57 void *
  58 eal_thread_loop(void *arg __rte_unused)
  59 {
  60         char c;
  61         int n, ret;
  62         unsigned int lcore_id;
  63         pthread_t thread_id;
  64         int m2w, w2m;
  65         char cpuset[RTE_CPU_AFFINITY_STR_LEN];
  66
  67         thread_id = pthread_self();
  68
  69         /* retrieve our lcore_id from the configuration structure */
  70         RTE_LCORE_FOREACH_WORKER(lcore_id) {
  71                 if (thread_id == lcore_config[lcore_id].thread_id)
  72                         break;
  73         }
  74         if (lcore_id == RTE_MAX_LCORE)
  75                 rte_panic("cannot retrieve lcore id\n");
  76
  77         m2w = lcore_config[lcore_id].pipe_main2worker[0];
  78         w2m = lcore_config[lcore_id].pipe_worker2main[1];
  79
  80         __rte_thread_init(lcore_id, &lcore_config[lcore_id].cpuset);
  81
  82         RTE_LOG(DEBUG, EAL, "lcore %u is ready (tid=%zx;cpuset=[%s])\n",
  83                 lcore_id, (uintptr_t)thread_id, cpuset);
  84
  85         /* read on our pipe to get commands */
  86         while (1) {
  87                 void *fct_arg;
  88
  89                 /* wait command */
  90                 do {
  91                         n = _read(m2w, &c, 1);
  92                 } while (n < 0 && errno == EINTR);
  93
  94                 if (n <= 0)
  95                         rte_panic("cannot read on configuration pipe\n");
  96
  97                 lcore_config[lcore_id].state = RUNNING;
  98
  99                 /* send ack */
 100                 n = 0;
 101                 while (n == 0 || (n < 0 && errno == EINTR))
 102                         n = _write(w2m, &c, 1);
 103                 if (n < 0)
 104                         rte_panic("cannot write on configuration pipe\n");
 105
 106                 if (lcore_config[lcore_id].f == NULL)
 107                         rte_panic("NULL function pointer\n");
 108
 109                 /* call the function and store the return value */
 110                 fct_arg = lcore_config[lcore_id].arg;
 111                 ret = lcore_config[lcore_id].f(fct_arg);
 112                 lcore_config[lcore_id].ret = ret;
 113                 lcore_config[lcore_id].f = NULL;
 114                 lcore_config[lcore_id].arg = NULL;
 115                 rte_wmb();
 116
 117                 /* when a service core returns, it should go directly to WAIT
 118                  * state, because the application will not lcore_wait() for it.
 119                  */
 120                 if (lcore_config[lcore_id].core_role == ROLE_SERVICE)
 121                         lcore_config[lcore_id].state = WAIT;
 122                 else
 123                         lcore_config[lcore_id].state = FINISHED;
 124         }
 125 }
 126
 127 /* function to create threads */
 128 int
 129 eal_thread_create(pthread_t *thread)
 130 {
 131         HANDLE th;
 132
 133         th = CreateThread(NULL, 0,
 134                 (LPTHREAD_START_ROUTINE)(ULONG_PTR)eal_thread_loop,
 135                                                 NULL, 0, (LPDWORD)thread);
 136         if (!th)
 137                 return -1;
 138
 139         SetPriorityClass(GetCurrentProcess(), NORMAL_PRIORITY_CLASS);
 140         SetThreadPriority(th, THREAD_PRIORITY_NORMAL);
 141
 142         return 0;
 143 }
 144
 145 /* get current thread ID */
 146 int
 147 rte_sys_gettid(void)
 148 {
 149         return GetCurrentThreadId();
 150 }
 151
 152 int
 153 rte_thread_setname(__rte_unused pthread_t id, __rte_unused const char *name)
 154 {
 155         /* TODO */
 156         /* This is a stub, not the expected result */
 157         return 0;
 158 }