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Fixed bug with self loopback packets in multithreaded environments

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This commit is contained in:
Mark Pizzolato
2011-04-18 16:07:23 -07:00
parent bafbba4df8
commit b577841d03
3 changed files with 27 additions and 4 deletions
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20
sim_ether.c
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@@ -151,6 +151,8 @@
Modification history:
18-Apr-11 MP Fixed race condition with self loopback packets in
multithreaded environments
09-Jan-11 MP Fixed missing crc data when USE_READER_THREAD is defined and
crc's are needed (only the pdp11_xu)
16-Dec-10 MP added priority boost for read and write threads when
@@ -1444,6 +1446,7 @@ t_stat eth_open(ETH_DEV* dev, char* name, DEVICE* dptr, uint32 dbit)
ethq_init (&dev->read_queue, 200); /* initialize FIFO queue */
pthread_mutex_init (&dev->lock, NULL);
pthread_mutex_init (&dev->writer_lock, NULL);
pthread_mutex_init (&dev->self_lock, NULL);
pthread_cond_init (&dev->writer_cond, NULL);
pthread_attr_init(&attr);
pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
@@ -1495,6 +1498,7 @@ t_stat eth_close(ETH_DEV* dev)
pthread_mutex_destroy (&dev->lock);
pthread_cond_signal (&dev->writer_cond);
pthread_join (dev->writer_thread, NULL);
pthread_mutex_destroy (&dev->self_lock);
pthread_mutex_destroy (&dev->writer_lock);
pthread_cond_destroy (&dev->writer_cond);
if (1) {
@@ -1534,8 +1538,10 @@ t_stat eth_check_address_conflict (ETH_DEV* dev,
ETH_PACK send, recv;
t_stat status;
int responses = 0;
char mac_string[32];
sim_debug(dev->dbit, dev->dptr, "Determining Address Conflict...\n");
eth_mac_fmt(mac, mac_string);
sim_debug(dev->dbit, dev->dptr, "Determining Address Conflict for MAC address: %s\n", mac_string);
/* build a loopback forward request packet */
memset (&send, 0, sizeof(ETH_PACK));
@@ -1617,8 +1623,14 @@ t_stat _eth_write(ETH_DEV* dev, ETH_PACK* packet, ETH_PCALLBACK routine)
/* detect sending of loopback packet */
if ((status == 0) && (LOOPBACK_SELF_FRAME(dev->physical_addr, packet->msg))) {
#ifdef USE_READER_THREAD
pthread_mutex_lock (&dev->self_lock);
#endif
dev->loopback_self_sent += dev->reflections;
dev->loopback_self_sent_total++;
#ifdef USE_READER_THREAD
pthread_mutex_unlock (&dev->self_lock);
#endif
}
} /* if packet->len */
@@ -2122,6 +2134,9 @@ _eth_callback(u_char* info, const struct pcap_pkthdr* header, const u_char* data
/* detect reception of loopback packet to our physical address */
if (LOOPBACK_SELF_FRAME(dev->physical_addr, data)) {
#ifdef USE_READER_THREAD
pthread_mutex_lock (&dev->self_lock);
#endif
dev->loopback_self_rcvd_total++;
/* lower reflection count - if already zero, pass it on */
if (dev->loopback_self_sent > 0) {
@@ -2132,6 +2147,9 @@ _eth_callback(u_char* info, const struct pcap_pkthdr* header, const u_char* data
#ifndef USE_BPF
else
from_me = 0;
#endif
#ifdef USE_READER_THREAD
pthread_mutex_unlock (&dev->self_lock);
#endif
}