#include <errno.h>
-typedef struct {
+typedef struct
+{
int m_numSems;
- off_t m_semaphoreHandles; // offset from beginning of header
- off_t m_semaphoreCounts; // offset from beginning of header
-} win32_sem_set_hdr;
+ off_t m_semaphoreHandles;
+ //offset from beginning of header
+ off_t m_semaphoreCounts;
+ //offset from beginning of header
+} win32_sem_set_hdr;
/* Control of a semaphore pool. The pool is an area in which we stored all
** the semIds of the pool. The first long is the number of semaphore
int
semctl(int semId, int semNum, int flag, union semun semun)
{
- win32_sem_set_hdr* the_set = (win32_sem_set_hdr*)MAKE_PTR(semId);
+ win32_sem_set_hdr *the_set = (win32_sem_set_hdr *) MAKE_PTR(semId);
/* semNum might be 0 */
/* semun.array contains the sem initial values */
- int* sem_counts = (int*)((off_t)the_set + the_set->m_semaphoreCounts);
+ int *sem_counts = (int *) ((off_t) the_set + the_set->m_semaphoreCounts);
/* Fix the count of all sem of the pool to semun.array */
if (flag == SETALL)
{
- int i;
+ int i;
struct sembuf sops;
+
sops.sem_flg = IPC_NOWAIT;
- for (i = 0; i < the_set->m_numSems; ++i) {
+ for (i = 0; i < the_set->m_numSems; ++i)
+ {
if (semun.array[i] == sem_counts[i])
- continue; /* Nothing to do */
+ continue; /* Nothing to do */
if (semun.array[i] < sem_counts[i])
sops.sem_op = -1;
sops.sem_op = 1;
sops.sem_num = i;
-
+
/* Quickly lock/unlock the semaphore (if we can) */
if (semop(semId, &sops, 1) < 0)
return -1;
/* Fix the count of one semaphore to semun.val */
else if (flag == SETVAL)
{
- if (semun.val != sem_counts[semNum]) {
+ if (semun.val != sem_counts[semNum])
+ {
struct sembuf sops;
+
sops.sem_flg = IPC_NOWAIT;
sops.sem_num = semNum;
sops.sem_op = -1;
else
sops.sem_op = 1;
-
+
/* Quickly lock/unlock the semaphore (if we can) */
if (semop(semId, &sops, 1) < 0)
return -1;
/* Delete the pool */
else if (flag == IPC_RMID)
{
- int i;
- HANDLE* sem_handles = (HANDLE*)((off_t)the_set + the_set->m_semaphoreHandles);
+ int i;
+ HANDLE *sem_handles = (HANDLE *) ((off_t) the_set + the_set->m_semaphoreHandles);
/* Loop over all semaphore to delete them */
for (i = 0; i < the_set->m_numSems; ++i)
/* Get the current semaphore count */
else if (flag == GETNCNT)
- {
return the_set->m_numSems;
- }
/* Get the current semaphore count of the first semaphore in the pool */
else if (flag == GETVAL)
- {
return sem_counts[semNum];
- }
/* Other commands not yet supported */
else
int
semget(int semKey, int semNum, int flags)
{
- char semname[32];
- char cur_num[20];
- DWORD last_error;
- char* num_part;
- bool ans = true;
+ char semname[32];
+ char cur_num[20];
+ DWORD last_error;
+ char *num_part;
+ bool ans = true;
SECURITY_ATTRIBUTES sec_attrs;
- HANDLE cur_handle;
- bool found = false;
- Size sem_set_size = sizeof(win32_sem_set_hdr) + semNum * (sizeof(HANDLE) + sizeof(int));
- HANDLE* sem_handles = NULL;
- int* sem_counts = NULL;
+ HANDLE cur_handle;
+ bool found = false;
+ Size sem_set_size = sizeof(win32_sem_set_hdr) + semNum * (sizeof(HANDLE) + sizeof(int));
+ HANDLE *sem_handles = NULL;
+ int *sem_counts = NULL;
sec_attrs.nLength = sizeof(sec_attrs);
sec_attrs.lpSecurityDescriptor = NULL;
sprintf(semname, "PG_SEMSET.%d.", semKey);
num_part = semname + strlen(semname);
- strcpy(num_part, _itoa(_getpid() * -1, cur_num, 10)); /* For shared memory, include the pid */
- win32_sem_set_hdr* new_set = (win32_sem_set_hdr*)ShmemInitStruct(semname, sem_set_size, &found);
+ strcpy(num_part, _itoa(_getpid() * -1, cur_num, 10)); /* For shared memory,
+ * include the pid */
+ win32_sem_set_hdr *new_set = (win32_sem_set_hdr *) ShmemInitStruct(semname, sem_set_size, &found);
- if (found) {
+ if (found)
+ {
/* This should *never* happen */
errno = EEXIST;
return -1;
}
new_set->m_numSems = semNum;
- new_set->m_semaphoreHandles = sizeof(win32_sem_set_hdr); // array starts after header
- new_set->m_semaphoreCounts = new_set->m_semaphoreHandles + (sizeof(HANDLE) * semNum);
+ new_set->m_semaphoreHandles = sizeof(win32_sem_set_hdr);
+ //array starts after header
+ new_set->m_semaphoreCounts = new_set->m_semaphoreHandles + (sizeof(HANDLE) * semNum);
- sem_handles = (HANDLE*)((off_t)new_set + new_set->m_semaphoreHandles);
- sem_counts = (int*)((off_t)new_set + new_set->m_semaphoreCounts);
+ sem_handles = (HANDLE *) ((off_t) new_set + new_set->m_semaphoreHandles);
+ sem_counts = (int *) ((off_t) new_set + new_set->m_semaphoreCounts);
- for (int i=0; i<semNum && ans; ++i) {
+ for (int i = 0; i < semNum && ans; ++i)
+ {
strcpy(num_part, _itoa(i, cur_num, 10));
if (flags & IPC_CREAT)
}
}
- if (ans) {
+ if (ans)
return MAKE_OFFSET(new_set);
- } else {
- // Blow away what we've got right now...
- for (int i=0; i<semNum; ++i) {
+ else
+ {
+ /* Blow away what we've got right now... */
+ for (int i = 0; i < semNum; ++i)
+ {
if (sem_handles[i])
CloseHandle(sem_handles[i]);
else
int
semop(int semId, struct sembuf * sops, int nsops)
{
- win32_sem_set_hdr* the_set = (win32_sem_set_hdr*)MAKE_PTR(semId);
- HANDLE* sem_handles = (HANDLE*)((off_t)the_set + the_set->m_semaphoreHandles);
- int* sem_counts = (int*)((off_t)the_set + the_set->m_semaphoreCounts);
- HANDLE cur_handle;
+ win32_sem_set_hdr *the_set = (win32_sem_set_hdr *) MAKE_PTR(semId);
+ HANDLE *sem_handles = (HANDLE *) ((off_t) the_set + the_set->m_semaphoreHandles);
+ int *sem_counts = (int *) ((off_t) the_set + the_set->m_semaphoreCounts);
+ HANDLE cur_handle;
- if (nsops != 1) {
- /* Not supported (we return on 1st success, and don't cancel earlier ops) */
+ if (nsops != 1)
+ {
+ /*
+ * Not supported (we return on 1st success, and don't cancel
+ * earlier ops)
+ */
errno = E2BIG;
return -1;
}
if (sops[0].sem_op == -1)
{
- DWORD ret;
+ DWORD ret;
+
if (sops[0].sem_flg & IPC_NOWAIT)
ret = WaitForSingleObject(cur_handle, 0);
else
ret = WaitForSingleObject(cur_handle, INFINITE);
- if (ret == WAIT_OBJECT_0) {
+ if (ret == WAIT_OBJECT_0)
+ {
/* We got it! */
sem_counts[sops[0].sem_num]--;
return 0;
- } else if (ret == WAIT_TIMEOUT)
+ }
+ else if (ret == WAIT_TIMEOUT)
/* Couldn't get it */
errno = EAGAIN;
else
errno = EIDRM;
}
- else if (sops[0].sem_op > 0) {
+ else if (sops[0].sem_op > 0)
+ {
/* Don't want the lock anymore */
sem_counts[sops[0].sem_num]++;
ReleaseSemaphore(cur_handle, sops[0].sem_op, NULL);
/* Attach to an existing area */
void *
-shmat(int memId, void* shmaddr, int flag)
+shmat(int memId, void *shmaddr, int flag)
{
- /* KEW_TODO -- shmat needs to count # attached to shared mem */
- void *lpmem = MapViewOfFileEx((HANDLE)memId,
- FILE_MAP_WRITE | FILE_MAP_READ,
- 0, 0, /* (DWORD)pshmdsc->segsize */ s_segsize, shmaddr);
+ /* TODO -- shmat needs to count # attached to shared mem */
+ void *lpmem = MapViewOfFileEx((HANDLE) memId,
+ FILE_MAP_WRITE | FILE_MAP_READ,
+ 0, 0, /* (DWORD)pshmdsc->segsize */ s_segsize, shmaddr);
- if (lpmem == NULL) {
- lpmem = (void *)-1;
+ if (lpmem == NULL)
+ {
+ lpmem = (void *) -1;
errno = GetLastError();
}
- return lpmem;
+ return lpmem;
}
/* Control a shared mem area */
if (flag == IPC_RMID)
{
/* Delete the area */
- CloseHandle((HANDLE)shmid);
+ CloseHandle((HANDLE) shmid);
return 0;
}
if (flag == IPC_STAT)
{
/* Can only test for if exists */
- int hmap = shmget(shmid, 0, 0);
- if (hmap < 0) {
+ int hmap = shmget(shmid, 0, 0);
+
+ if (hmap < 0)
+ {
/* Shared memory does not exist */
errno = EINVAL;
return -1;
}
- else {
+ else
+ {
/* Shared memory does exist and must be in use */
- shmctl(hmap, IPC_RMID, NULL); /* Release our hold on it */
+ shmctl(hmap, IPC_RMID, NULL); /* Release our hold on it */
errno = 0;
return 0;
}
int
shmget(int memKey, int size, int flag)
{
- HANDLE hmap;
- char szShareMem[32];
- DWORD dwRet;
+ HANDLE hmap;
+ char szShareMem[32];
+ DWORD dwRet;
- s_segsize = size;
- sprintf(szShareMem, "sharemem.%d", memKey);
+ s_segsize = size;
+ sprintf(szShareMem, "sharemem.%d", memKey);
- if (flag & IPC_CREAT) {
- hmap = CreateFileMapping((HANDLE)0xFFFFFFFF, /* Use the swap file */
- NULL,
- PAGE_READWRITE, /* Memory is Read/Write */
- 0L, /* Size Upper 32 Bits */
- (DWORD)s_segsize, /* Size Lower 32 bits*/
- szShareMem);
+ if (flag & IPC_CREAT)
+ {
+ hmap = CreateFileMapping((HANDLE) 0xFFFFFFFF, /* Use the swap file */
+ NULL,
+ PAGE_READWRITE, /* Memory is Read/Write */
+ 0L, /* Size Upper 32 Bits */
+ (DWORD) s_segsize, /* Size Lower 32 bits */
+ szShareMem);
}
- else {
+ else
+ {
hmap = OpenFileMapping(FILE_MAP_ALL_ACCESS,
- FALSE,
- szShareMem);
- if (!hmap) {
+ FALSE,
+ szShareMem);
+ if (!hmap)
+ {
errno = ENOENT;
return -1;
}
}
dwRet = GetLastError();
- if (dwRet == ERROR_ALREADY_EXISTS && hmap && (flag & (IPC_CREAT | IPC_EXCL))) {
+ if (dwRet == ERROR_ALREADY_EXISTS && hmap && (flag & (IPC_CREAT | IPC_EXCL)))
+ {
/* Caller wanted to create the segment -- error if already exists */
CloseHandle(hmap);
errno = EEXIST;
return -1;
}
- return (int)hmap;
+ return (int) hmap;
}
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