Mercurial > repos > rhope
annotate runtime/context.c @ 140:c14698c512f1
Untested addition of Pause/Resume
author | Mike Pavone <pavone@retrodev.com> |
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date | Sat, 20 Nov 2010 20:03:25 +0000 |
parents | a68e6828d896 |
children | f2cb85c53ced |
rev | line source |
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1 #include "context.h" |
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2 #include "object.h" |
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3 #include "thread.h" |
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4 #include <stdlib.h> |
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5 #include <stddef.h> |
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6 #include <stdio.h> |
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7 |
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8 context * contextqueue[32]; |
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9 int32_t cq_readloc=0; |
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10 int32_t cq_writeloc=0; |
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11 rh_mutex(cq_lock) |
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12 |
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13 void cqueue_init() |
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14 { |
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15 rh_mutex_init(cq_lock); |
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16 } |
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17 |
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18 context * get_cqueue() |
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19 { |
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20 context * ret; |
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21 rh_lock(cq_lock); |
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22 if (cq_readloc == cq_writeloc) |
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23 { |
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24 rh_unlock(cq_lock); |
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25 return NULL; |
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26 } |
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27 ret = contextqueue[cq_readloc++]; |
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28 if (cq_readloc == 32) |
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29 cq_readloc = 0; |
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30 rh_unlock(cq_lock); |
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31 return ret; |
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32 } |
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33 |
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34 int32_t put_cqueue(context * ct) |
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35 { |
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36 rh_lock(cq_lock); |
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37 if ((cq_writeloc+1)&31 == cq_readloc) |
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38 { |
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39 rh_unlock(cq_lock); |
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40 return 0; |
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41 } |
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42 contextqueue[cq_writeloc++] = ct; |
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43 rh_unlock(cq_lock); |
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44 return 1; |
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45 } |
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46 |
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47 stackchunk * new_stack() |
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48 { |
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49 stackchunk * st = malloc(sizeof(stackchunk)); |
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50 st->prev = NULL; |
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51 st->next = NULL; |
67 | 52 st->free_space = st->data; |
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53 return st; |
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54 } |
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55 |
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56 context * new_context() |
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57 { |
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58 context * c = malloc(sizeof(context)); |
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59 c->stack_begin = new_stack(); |
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60 c->current_stack = c->stack_begin; |
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61 c->resume_cdata = c->runafter = c->transaction = NULL; |
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62 c->resumeable = 0; |
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63 c->start_func = -1; |
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64 return c; |
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65 } |
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66 |
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67 void free_context(context * c) |
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68 { |
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69 stackchunk *next,*current = c->stack_begin; |
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70 while(current) |
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71 { |
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72 next = current->next; |
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73 free(current); |
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74 current = next; |
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75 } |
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76 free(c); |
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77 } |
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78 |
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79 void * alloc_stack(context * ct, uint32_t size) |
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80 { |
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81 void * ret; |
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82 stackchunk * current = ct->current_stack; |
67 | 83 char * next_free = current->free_space + size; |
84 if (next_free <= (current->data + STACK_CHUNK_SIZE)) | |
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85 { |
67 | 86 ret = current->free_space; |
87 current->free_space = next_free; | |
88 return ret; | |
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89 } |
67 | 90 if (!current->next) |
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91 { |
67 | 92 current->next = new_stack(); |
93 current->next->prev = current; | |
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94 } |
67 | 95 current = current->next; |
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96 ct->current_stack = current; |
67 | 97 current->free_space = current->data + size; |
98 return current->data; | |
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99 } |
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100 |
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101 calldata * alloc_cdata(context * ct, calldata * lastframe, uint32_t num_params) |
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102 { |
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103 //Make sure we have enough space for at least 32 return values |
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104 calldata * retval = alloc_stack(ct, sizeof(calldata)+(31)*sizeof(object *)); |
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105 //But only actually reserve space for the number requested |
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106 free_stack(ct, retval->params + num_params); |
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107 retval->lastframe = lastframe; |
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108 retval->callspace = num_params; |
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109 return retval; |
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110 } |
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111 |
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112 void free_stack(context * ct, void * data) |
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113 { |
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114 char * cdata = data; |
67 | 115 while(cdata < ct->current_stack->data || cdata >= ct->current_stack->free_space) |
116 { | |
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117 if(ct->current_stack == ct->stack_begin) |
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118 { |
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119 fprintf(stderr, "Attempt to free memory at %X using free_stack, but %X doesn't appear to be stack allocated\n", data, data); |
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120 exit(-1); |
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121 } |
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122 ct->current_stack = ct->current_stack->prev; |
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123 } |
67 | 124 ct->current_stack->free_space = data; |
125 if(ct->current_stack->free_space == ct->current_stack->data && ct->current_stack->prev) | |
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126 ct->current_stack = ct->current_stack->prev; |
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127 } |
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128 |