github.com/twelsh-aw/go/src@v0.0.0-20230516233729-a56fe86a7c81/runtime/cgo/gcc_linux_riscv64.c (about)

     1  // Copyright 2020 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  #include <pthread.h>
     6  #include <string.h>
     7  #include <signal.h>
     8  #include "libcgo.h"
     9  #include "libcgo_unix.h"
    10  
    11  static void *threadentry(void*);
    12  
    13  void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
    14  static void (*setg_gcc)(void*);
    15  
    16  void
    17  _cgo_sys_thread_start(ThreadStart *ts)
    18  {
    19  	pthread_attr_t attr;
    20  	sigset_t ign, oset;
    21  	pthread_t p;
    22  	size_t size;
    23  	int err;
    24  
    25  	sigfillset(&ign);
    26  	pthread_sigmask(SIG_SETMASK, &ign, &oset);
    27  
    28  	pthread_attr_init(&attr);
    29  	pthread_attr_getstacksize(&attr, &size);
    30  	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
    31  	ts->g->stackhi = size;
    32  	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
    33  
    34  	pthread_sigmask(SIG_SETMASK, &oset, nil);
    35  
    36  	if (err != 0) {
    37  		fatalf("pthread_create failed: %s", strerror(err));
    38  	}
    39  }
    40  
    41  extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
    42  static void*
    43  threadentry(void *v)
    44  {
    45  	ThreadStart ts;
    46  
    47  	ts = *(ThreadStart*)v;
    48  	free(v);
    49  
    50  	crosscall1(ts.fn, setg_gcc, (void*)ts.g);
    51  	return nil;
    52  }
    53  
    54  void
    55  x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
    56  {
    57  	pthread_attr_t attr;
    58  	size_t size;
    59  
    60  	setg_gcc = setg;
    61  	pthread_attr_init(&attr);
    62  	pthread_attr_getstacksize(&attr, &size);
    63  	g->stacklo = (uintptr)&attr - size + 4096;
    64  	pthread_attr_destroy(&attr);
    65  
    66  	if (x_cgo_inittls) {
    67  		x_cgo_inittls(tlsg, tlsbase);
    68  	}
    69  }