-
Notifications
You must be signed in to change notification settings - Fork 0
/
simul.c
242 lines (199 loc) · 6.93 KB
/
simul.c
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
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
/***********************************************************************/
/** Author: Minas Spetsakis **/
/** Date: Jun. 2019 **/
/** Description: Skeleton code for Assgn. II **/
/***********************************************************************/
#include <stdio.h>
#include <sys/time.h>
#include <string.h>
#include <stdlib.h>
#include <pthread.h>
#include "args.h"
#include "error.h"
/* PHILOSOPHER STATES */
#define THINKING 1
#define HUNGRY 2
#define EATING 3
int N=5, T=100;
double lam=0.1, mu=0.2;
int nblocked; /* The number of threads blocked */
int thinkingTicks, hungryTicks, eatingTicks;
int seats;
int start_line = 0;
/***********************************************************************
P H I L O S O P H E R
************************************************************************/
void *philosopher(void *vptr)
{
unsigned int seed; /* This is called from main without */
int pthrerr; /* creating a new thread */
struct thread_arg *ptr;
int rng; //int to hold random integer
ptr = (struct thread_arg*)vptr;
int start = 0; // value to wait for start line
int state = 1; // state count
// printf("I am %d\n", (ptr -> id));
while (start == 0) //start_line creation
{
pthrerr = pthread_mutex_lock(ptr -> pMutex);
if (pthrerr != 0)
fatalerr("philosopher", pthrerr, "Mutex error! Lock");
while ((ptr -> id) < (ptr -> N)){
pthrerr = pthread_cond_wait((ptr -> pstart_line), (ptr -> pMutex)); //wait for condition from main thread to run all threads
if (pthrerr != 0)
fatalerr("philosopher", pthrerr, "startline error!");
}
pthrerr = pthread_mutex_unlock((ptr -> pMutex));
if (pthrerr != 0)
fatalerr("philosopher", pthrerr, "Mutex error! Unlock");
// printf("started thread# %d! \n", (ptr -> id));
start = 1;
}
while(1){ //dining philosopher algorithm
rng = rand0_1(&(ptr -> seed));
pthrerr = pthread_mutex_lock(ptr -> pMutex);
if (pthrerr != 0)
fatalerr("philosopher", pthrerr, "Mutex error! lock!");
pthrerr = pthread_cond_wait((ptr -> pclkCond), (ptr -> pMutex)); //wait for clock tick
if (pthrerr != 0)
fatalerr("philosopher", pthrerr, "clock Condition error!");
//roll for state change now
if(state == THINKING){ //check for THINKING state
if(rng < (ptr -> lam)){ //if less than lam, change state to HUNGRY and increment thinkingTime
state = HUNGRY;
}
thinkingTicks++;
}
else if(state == HUNGRY){ //check for HUNGRY state
if(seats > 0){ //if enough seats are available, change to EATING state
state = EATING;
seats--;
}
hungryTicks++;
}
else if(state == EATING){
if(rng < (ptr -> mu)){ //if done eating, change to THINKING state
state = THINKING;
seats++;
}
eatingTicks++;
}
start++;
pthread_mutex_unlock(ptr-> pMutex); //unlock mutex
if(start > (ptr -> T))
printf("Thinking=%d Hungry=%d Eating=%d \n", thinkingTicks, hungryTicks, eatingTicks);
exit(0);
}
return NULL;
}
/***********************************************************************
C L K
************************************************************************/
void *clk(void *vptr)
{
int tick;
int pthrerr;
struct thread_arg *ptr;
ptr = (struct thread_arg*)vptr;
for(tick = 0; tick < (ptr -> T); tick++){ //Clock Tick for philosophers
pthrerr = pthread_cond_broadcast((ptr -> pclkCond));
if (pthrerr != 0)
fatalerr("CLK", pthrerr, "Clock Broadcast Failed!");
}
// printf("Thinking=%d Hungry=%d Eating=%d \n", thinkingTicks, hungryTicks, eatingTicks);
printf("Average Thinking Time: %6.2f\n", (float)thinkingTicks/(float)(T * N));
printf("Average Hungry Time: %6.2f\n", (float)hungryTicks/(float)(T * N));
printf("Average Eating Time: %6.2f\n", (float)eatingTicks/(float)(T * N));
// fatalerr("CLK", 0, "Not yet implemented");
exit(0);
}
/***********************************************************************
M A I N
************************************************************************/
int main(int argc, char **argv)
{
int pthrerr, i;
int nserver, nclient, nTicks;
float lam, mu;
int i_c = 1;
while (i_c < argc - 1)
{
if (strcmp(argv[i_c], "-N") == 0)
{
N = atoi(argv[++i_c]);
}
else if (strcmp(argv[i_c], "-T") == 0)
{
nTicks = atoi(argv[++i_c]);
}
else if (strcmp(argv[i_c], "-L") == 0)
{
lam = atof(argv[++i_c]);
}
else if (strcmp(argv[i_c], "-M") == 0)
{
mu = atof(argv[++i_c]);
}
else
{
fatalerr(argv[i_c], 0, "Invalid argument\n");
}
}
// printf("N = %d\n", N);
pthread_t phil_tid;
pthread_cond_t blockCond, clkCond, startline;
pthread_mutex_t cpMutex;
struct thread_arg *allargs;
pthread_t *alltids;
thinkingTicks = 0;
hungryTicks = 0;
eatingTicks = 0;
pthrerr = pthread_cond_init(&blockCond, NULL);
if (pthrerr!=0) /* Initializers never return an error code */
fatalerr(argv[0], 0,"Initialization failed\n");
pthrerr = pthread_cond_init(&clkCond, NULL);
if (pthrerr!=0)
fatalerr(argv[0], 0,"Initialization failed\n");
pthrerr = pthread_cond_init(&startline, NULL);
if (pthrerr!=0)
fatalerr(argv[0], 0,"Initialization failed\n");
pthrerr = pthread_mutex_init(&cpMutex, NULL);
if (pthrerr!=0)
fatalerr(argv[0], 0,"Initialization failed\n");
allargs = (struct thread_arg *)
malloc((N+1) * sizeof(struct thread_arg));
if (allargs==NULL)
fatalerr(argv[0], 0,"Out of memory\n");
alltids = (pthread_t*)
malloc((N)*sizeof(pthread_t));
if (alltids==NULL)
fatalerr(argv[0], 0,"Out of memory\n");
allargs[0].N = N;
allargs[0].T = nTicks;
allargs[0].lam = lam;
allargs[0].mu = mu;
allargs[0].id = 1;
allargs[0].pBlockCond = &blockCond;
allargs[0].pclkCond = &clkCond;
allargs[0].pMutex = &cpMutex;
allargs[0].pstart_line = &startline;
allargs[0].seed = 40;
allargs[0].thinkingTime = 0;
allargs[0].hungryTime = 0;
allargs[0].eatingTime = 0;
seats = N - 1;
for(i = 0; i < N; i++){
allargs[i] = allargs[0];
allargs[1].seed+= i;
allargs[i].id += i;
pthrerr = pthread_create(alltids+i, NULL, philosopher, allargs+i);
if(pthrerr != 0){
fatalerr(argv[0], pthrerr, "Philosopher creation failed!\n");
}
}
start_line = 1;
pthread_cond_broadcast(allargs[0].pstart_line);
clk((void*) (allargs + N));
printf("Should not be here\n");
exit(-1);
}