summaryrefslogtreecommitdiff
path: root/cleanup.c
blob: c956ce7542563dcb087d567f77e316055bb5096c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
/*
 * cleanup.c
 *
 * Description:
 * This translation unit implements routines associated cleaning up
 * threads.
 */

#include <errno.h>

#include <malloc.h>
#include "pthread.h"
#include "implement.h"

int
_pthread_handler_push(int stack,
		      int poporder,
		      void (*routine)(void *), 
		      void *arg)
{
  /* Place the new handler into the list so that handlers are
     popped off in the order given by poporder. */
  _pthread_handler_node_t * new_thread;
  _pthread_handler_node_t * next;
  _pthread_handler_node_t ** stacktop;

  stacktop = _PTHREAD_STACK(stack);

  new_thread = 
    (_pthread_handler_node_t *) malloc(sizeof(_pthread_handler_node_t));

  if (new_thread == NULL)
    {
      return 0; /* NOMEM */
    }

  new_thread->routine = routine;
  new_thread->arg = arg;

  if (poporder == _PTHREAD_HANDLER_POP_LIFO)
    {
      /* Add the new node to the start of the list. */
      new_thread->next = *stacktop;
      *stacktop = next;
    }
  else
    {
      /* Add the new node to the end of the list. */
      new_thread->next = NULL;

      if (*stacktop == NULL)
	{
	  *stacktop = new_thread;
	}
      else
	{
	  next = *stacktop;

	  while (next != NULL)
	    {
	      next = next->next;
	    }

	  next = new_thread;
	}
    }
  return 0;
}

void
_pthread_handler_pop(int stack, int execute)
{
  _pthread_handler_node_t ** stacktop;
  _pthread_handler_node_t * next;
  void (* func)(void *);
  void * arg;

  stacktop = _PTHREAD_STACK(stack);

  if (*stacktop != NULL)
    {
      func = (*stacktop)->routine;
      arg = (*stacktop)->arg;
      next = (*stacktop)->next;

      free(*stacktop);
      *stacktop = next;

      if (execute != 0 && func != NULL)
	{
	  (void) func(arg);
	}
    }
}

void
_pthread_handler_pop_all(int stack, int execute)
{
  /* Pop and possibly run all handlers on the given stack. */
  _pthread_handler_node_t ** stacktop;
  _pthread_handler_node_t * next;
  void (* func)(void *);
  void * arg;

  stacktop = _PTHREAD_STACK(stack);

  while (*stacktop != NULL)
    {
      func = (*stacktop)->routine;
      arg = (*stacktop)->arg;
      next = (*stacktop)->next;

      free(*stacktop);
      *stacktop = next;

      if (execute != 0 && func != NULL)
	{
	  (void) func(arg);
	}
    }
}

/* Run destructors for all non-NULL key values for the calling thread.
 */
void
_pthread_destructor_run_all()
{
  _pthread_tsd_key_t * k;
  void * arg;
  int count;

  k = _pthread_tsd_key_table;

  /* Stop destructor execution at a finite time. POSIX allows us
     to ignore this if we like, even at the risk of an infinite loop.
   */
  for (count = 0; count < PTHREAD_DESTRUCTOR_ITERATIONS; count++)
    {
      /* Loop through all keys. */
      for (key = 0; key < _POSIX_THREAD_KEYS_MAX; key++)
	{
	  if (k->in_use != 1)
	    continue;

	  arg = pthread_getspecific(key);

	  if (arg != NULL && k->destructor != NULL)
	    {
	      (void) (k->destructor)(arg);
	    }

	  k++;
	}
    }
}