/*
* Copyright (c) 2018, NVIDIA CORPORATION. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
#include <nvgpu/bug.h>
#include <nvgpu/thread.h>
#include <nvgpu/posix/thread.h>
/**
* Use pthreads to mostly emulate the Linux kernel APIs. There are some things
* that are quite different - especially the stop/should_stop notions. In user
* space threads can send signals to one another but of course within the kernel
* that is not as simple.
*
* This could use some nice debugging some day as well.
*/
/*
* nvgpu thread functions return int. POSIX threads return void *. This little
* wrapper takes the int returning nvgpu thread and instead passes that int back
* through the void * pointer.
*/
static void *__nvgpu_posix_thread_wrapper(void *data)
{
struct nvgpu_posix_thread_data *nvgpu = data;
return ERR_PTR(nvgpu->fn(nvgpu->data));
}
int nvgpu_thread_create(struct nvgpu_thread *thread,
void *data,
int (*threadfn)(void *data), const char *name)
{
int ret;
BUG_ON(thread->running);
memset(thread, 0, sizeof(*thread));
/*
* By subtracting 1 the above memset ensures that we have a zero
* terminated string.
*/
strncpy(thread->tname, name, NVGPU_THREAD_POSIX_MAX_NAMELEN - 1);
thread->nvgpu.data = data;
thread->nvgpu.fn = threadfn;
ret = pthread_create(&thread->thread, NULL,
__nvgpu_posix_thread_wrapper,
&thread->nvgpu);
if (ret != 0)
return ret;
#ifdef _GNU_SOURCE
pthread_setname_np(thread->thread, thread->tname);
#endif
thread->running = true;
return 0;
}
void nvgpu_thread_stop(struct nvgpu_thread *thread)
{
thread->should_stop = true;
}
bool nvgpu_thread_should_stop(struct nvgpu_thread *thread)
{
return thread->should_stop;
}
bool nvgpu_thread_is_running(struct nvgpu_thread *thread)
{
return thread->running;
}
void nvgpu_thread_join(struct nvgpu_thread *thread)
{
(void) pthread_join(thread->thread, NULL);
}
