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#include "MassStorage.h"
#include "Platform.h"
#include "RepRap.h"
#include "sd_mmc.h"
// Check that the LFN configuration in FatFS is sufficient
static_assert(FF_MAX_LFN >= MaxFilenameLength, "FF_MAX_LFN too small");
// A note on using mutexes:
// Each SD card volume has its own mutex. There is also one for the file table, and one for the find first/find next buffer.
// The FatFS subsystem locks and releases the appropriate volume mutex when it is called.
// Any function that needs to acquire both the file table mutex and a volume mutex MUST take the file table mutex first, to avoid deadlocks.
// Any function that needs to acquire both the find buffer mutex and a volume mutex MUST take the find buffer mutex first, to avoid deadlocks.
// No function should need to take both the file table mutex and the find buffer mutex.
// No function in here should be called when the caller already owns the shared SPI mutex.
#if HAS_MASS_STORAGE
// Private data and methods
enum class CardDetectState : uint8_t
{
notPresent = 0,
inserting,
present,
removing
};
struct SdCardInfo
{
FATFS fileSystem;
uint32_t cdChangedTime;
uint32_t mountStartTime;
Mutex volMutex;
Pin cdPin;
bool mounting;
bool isMounted;
CardDetectState cardState;
};
static SdCardInfo info[NumSdCards];
static Mutex fsMutex, dirMutex;
static FileInfoParser infoParser;
static DIR findDir;
static FileWriteBuffer *freeWriteBuffers;
static FileStore files[MAX_FILES];
// Static helper functions
FileWriteBuffer *MassStorage::AllocateWriteBuffer() noexcept
{
MutexLocker lock(fsMutex);
if (freeWriteBuffers == nullptr)
{
return nullptr;
}
FileWriteBuffer * const buffer = freeWriteBuffers;
freeWriteBuffers = buffer->Next();
buffer->SetNext(nullptr);
return buffer;
}
void MassStorage::ReleaseWriteBuffer(FileWriteBuffer *buffer) noexcept
{
MutexLocker lock(fsMutex);
buffer->SetNext(freeWriteBuffers);
freeWriteBuffers = buffer;
}
// Unmount a file system returning the number of open files were invalidated
static unsigned int InternalUnmount(size_t card, bool doClose) noexcept
{
SdCardInfo& inf = info[card];
MutexLocker lock1(fsMutex);
MutexLocker lock2(inf.volMutex);
const unsigned int invalidated = MassStorage::InvalidateFiles(&inf.fileSystem, doClose);
const char path[3] = { (char)('0' + card), ':', 0 };
f_mount(nullptr, path, 0);
memset(&inf.fileSystem, 0, sizeof(inf.fileSystem));
sd_mmc_unmount(card);
inf.isMounted = false;
return invalidated;
}
static time_t ConvertTimeStamp(uint16_t fdate, uint16_t ftime) noexcept
{
struct tm timeInfo;
memset(&timeInfo, 0, sizeof(timeInfo));
timeInfo.tm_year = (fdate >> 9) + 80;
const uint16_t month = (fdate >> 5) & 0x0F;
timeInfo.tm_mon = (month == 0) ? month : month - 1; // month is 1..12 in FAT but 0..11 in struct tm
timeInfo.tm_mday = max<int>(fdate & 0x1F, 1);
timeInfo.tm_hour = (ftime >> 11) & 0x1F;
timeInfo.tm_min = (ftime >> 5) & 0x3F;
timeInfo.tm_sec = ftime & 0x1F;
timeInfo.tm_isdst = 0;
return mktime(&timeInfo);
}
static const char* TranslateCardType(card_type_t ct) noexcept
{
switch (ct)
{
case CARD_TYPE_SD | CARD_TYPE_HC:
return "SDHC";
case CARD_TYPE_SD:
return "SD";
case CARD_TYPE_MMC | CARD_TYPE_HC:
return "MMC High Capacity";
case CARD_TYPE_MMC:
return "MMC";
case CARD_TYPE_SDIO:
return "SDIO";
case CARD_TYPE_SD_COMBO:
return "SD COMBO";
case CARD_TYPE_UNKNOWN:
default:
return "Unknown type";
}
}
static const char* TranslateCardError(sd_mmc_err_t err) noexcept
{
switch (err)
{
case SD_MMC_ERR_NO_CARD:
return "Card not found";
case SD_MMC_ERR_UNUSABLE:
return "Card is unusable";
case SD_MMC_ERR_SLOT:
return "Slot unknown";
case SD_MMC_ERR_COMM:
return "Communication error";
case SD_MMC_ERR_PARAM:
return "Illegal input parameter";
case SD_MMC_ERR_WP:
return "Card write protected";
default:
return "Unknown error";
}
}
void MassStorage::Init() noexcept
{
static const char * const VolMutexNames[] = { "SD0", "SD1" };
static_assert(ARRAY_SIZE(VolMutexNames) >= NumSdCards, "Incorrect VolMutexNames array");
// Create the mutexes
fsMutex.Create("FileSystem");
dirMutex.Create("DirSearch");
freeWriteBuffers = nullptr;
for (size_t i = 0; i < NumFileWriteBuffers; ++i)
{
freeWriteBuffers = new FileWriteBuffer(freeWriteBuffers);
}
for (size_t card = 0; card < NumSdCards; ++card)
{
SdCardInfo& inf = info[card];
memset(&inf.fileSystem, 0, sizeof(inf.fileSystem));
inf.mounting = inf.isMounted = false;
inf.cdPin = SdCardDetectPins[card];
inf.cardState = (inf.cdPin == NoPin) ? CardDetectState::present : CardDetectState::notPresent;
inf.volMutex.Create(VolMutexNames[card]);
}
sd_mmc_init(SdWriteProtectPins, SdSpiCSPins); // initialize SD MMC stack
// We no longer mount the SD card here because it may take a long time if it fails
}
FileStore* MassStorage::OpenFile(const char* filePath, OpenMode mode, uint32_t preAllocSize) noexcept
{
{
MutexLocker lock(fsMutex);
for (size_t i = 0; i < MAX_FILES; i++)
{
if (files[i].IsFree())
{
return (files[i].Open(filePath, mode, preAllocSize)) ? &files[i]: nullptr;
}
}
}
reprap.GetPlatform().Message(ErrorMessage, "Max open file count exceeded.\n");
return nullptr;
}
// Close all files
void MassStorage::CloseAllFiles() noexcept
{
MutexLocker lock(fsMutex);
for (FileStore& f : files)
{
while (!f.IsFree())
{
f.Close();
}
}
}
// Construct a full path name from a path and a filename. Returns false if error i.e. filename too long
/*static*/ bool MassStorage::CombineName(const StringRef& outbuf, const char* directory, const char* fileName) noexcept
{
bool hadError = false;
if (directory != nullptr && directory[0] != 0 && fileName[0] != '/' && (strlen(fileName) < 2 || !isdigit(fileName[0]) || fileName[1] != ':'))
{
hadError = outbuf.copy(directory);
if (!hadError)
{
const size_t len = outbuf.strlen();
if (len != 0 && outbuf[len - 1] != '/')
{
hadError = outbuf.cat('/');
}
}
}
else
{
outbuf.Clear();
}
if (!hadError)
{
hadError = outbuf.cat(fileName);
}
if (hadError)
{
reprap.GetPlatform().MessageF(ErrorMessage, "Filename too long: cap=%u, dir=%.12s%s name=%.12s%s\n",
outbuf.Capacity(),
directory, (strlen(directory) > 12 ? "..." : ""),
fileName, (strlen(fileName) > 12 ? "..." : "")
);
outbuf.copy("?????");
}
return !hadError;
}
// Open a directory to read a file list. Returns true if it contains any files, false otherwise.
// If this returns true then the file system mutex is owned. The caller must subsequently release the mutex either
// by calling FindNext until it returns false, or by calling AbandonFindNext.
bool MassStorage::FindFirst(const char *directory, FileInfo &file_info) noexcept
{
// Remove any trailing '/' from the directory name, it sometimes (but not always) confuses f_opendir
String<MaxFilenameLength> loc;
loc.copy(directory);
const size_t len = loc.strlen();
if (len != 0 && (loc[len - 1] == '/' || loc[len - 1] == '\\'))
{
loc.Truncate(len - 1);
}
if (!dirMutex.Take(10000))
{
return false;
}
FRESULT res = f_opendir(&findDir, loc.c_str());
if (res == FR_OK)
{
FILINFO entry;
for (;;)
{
res = f_readdir(&findDir, &entry);
if (res != FR_OK || entry.fname[0] == 0) break;
if (!StringEqualsIgnoreCase(entry.fname, ".") && !StringEqualsIgnoreCase(entry.fname, ".."))
{
file_info.isDirectory = (entry.fattrib & AM_DIR);
file_info.fileName.copy(entry.fname);
file_info.size = entry.fsize;
file_info.lastModified = ConvertTimeStamp(entry.fdate, entry.ftime);
return true;
}
}
f_closedir(&findDir);
}
dirMutex.Release();
return false;
}
// Find the next file in a directory. Returns true if another file has been read.
// If it returns false then it also releases the mutex.
bool MassStorage::FindNext(FileInfo &file_info) noexcept
{
if (dirMutex.GetHolder() != RTOSIface::GetCurrentTask())
{
return false; // error, we don't hold the mutex
}
FILINFO entry;
if (f_readdir(&findDir, &entry) != FR_OK || entry.fname[0] == 0)
{
f_closedir(&findDir);
dirMutex.Release();
return false;
}
file_info.isDirectory = (entry.fattrib & AM_DIR);
file_info.size = entry.fsize;
file_info.fileName.copy(entry.fname);
file_info.lastModified = ConvertTimeStamp(entry.fdate, entry.ftime);
return true;
}
// Quit searching for files. Needed to avoid hanging on to the mutex. Safe to call even if the caller doesn't hold the mutex.
void MassStorage::AbandonFindNext() noexcept
{
if (dirMutex.GetHolder() == RTOSIface::GetCurrentTask())
{
dirMutex.Release();
}
}
// Month names. The first entry is used for invalid month numbers.
static const char *monthNames[13] = { "???", "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
// Returns the name of the specified month or '???' if the specified value is invalid.
const char* MassStorage::GetMonthName(const uint8_t month) noexcept
{
return (month <= 12) ? monthNames[month] : monthNames[0];
}
// Delete a file or directory
bool MassStorage::Delete(const char* filePath) noexcept
{
FRESULT unlinkReturn;
bool isOpen = false;
// Start new scope to lock the filesystem for the minimum time
{
MutexLocker lock(fsMutex);
// First check whether the file is open - don't allow it to be deleted if it is, because that may corrupt the file system
FIL file;
const FRESULT openReturn = f_open(&file, filePath, FA_OPEN_EXISTING | FA_READ);
if (openReturn == FR_OK)
{
for (const FileStore& fil : files)
{
if (fil.IsSameFile(file))
{
isOpen = true;
break;
}
}
f_close(&file);
}
if (!isOpen)
{
unlinkReturn = f_unlink(filePath);
}
}
if (isOpen)
{
reprap.GetPlatform().MessageF(ErrorMessage, "Cannot delete file %s because it is open\n", filePath);
return false;
}
if (unlinkReturn != FR_OK)
{
// If the error was that the file or path doesn't exist, don't generate a global error message, but still return false
if (unlinkReturn != FR_NO_FILE && unlinkReturn != FR_NO_PATH)
{
reprap.GetPlatform().MessageF(ErrorMessage, "Failed to delete file %s\n", filePath);
}
return false;
}
return true;
}
// Create a new directory
bool MassStorage::MakeDirectory(const char *parentDir, const char *dirName) noexcept
{
String<MaxFilenameLength> location;
if (!CombineName(location.GetRef(), parentDir, dirName))
{
return false;
}
if (f_mkdir(location.c_str()) != FR_OK)
{
reprap.GetPlatform().MessageF(ErrorMessage, "Failed to create directory %s\n", location.c_str());
return false;
}
return true;
}
bool MassStorage::MakeDirectory(const char *directory) noexcept
{
if (f_mkdir(directory) != FR_OK)
{
reprap.GetPlatform().MessageF(ErrorMessage, "Failed to create directory %s\n", directory);
return false;
}
return true;
}
// Rename a file or directory
bool MassStorage::Rename(const char *oldFilename, const char *newFilename) noexcept
{
if (newFilename[0] >= '0' && newFilename[0] <= '9' && newFilename[1] == ':')
{
// Workaround for DWC 1.13 which send a volume specification at the start of the new path.
// f_rename can't handle this, so skip past the volume specification.
// We are assuming that the user isn't really trying to rename across volumes. This is a safe assumption when the client is DWC.
newFilename += 2;
}
if (f_rename(oldFilename, newFilename) != FR_OK)
{
reprap.GetPlatform().MessageF(ErrorMessage, "Failed to rename file or directory %s to %s\n", oldFilename, newFilename);
return false;
}
return true;
}
// Check if the specified file exists
bool MassStorage::FileExists(const char *filePath) noexcept
{
FILINFO fil;
return (f_stat(filePath, &fil) == FR_OK);
}
// Check if the specified directory exists
// Warning: if 'path' has a trailing '/' or '\\' character, it will be removed!
bool MassStorage::DirectoryExists(const StringRef& path) noexcept
{
// Remove any trailing '/' from the directory name, it sometimes (but not always) confuses f_opendir
const size_t len = path.strlen();
if (len != 0 && (path[len - 1] == '/' || path[len - 1] == '\\'))
{
path.Truncate(len - 1);
}
DIR dir;
const bool ok = (f_opendir(&dir, path.c_str()) == FR_OK);
if (ok)
{
f_closedir(&dir);
}
return ok;
}
// Check if the specified directory exists
bool MassStorage::DirectoryExists(const char *path) noexcept
{
// Remove any trailing '/' from the directory name, it sometimes (but not always) confuses f_opendir
String<MaxFilenameLength> loc;
loc.copy(path);
return DirectoryExists(loc.GetRef());
}
// Return the last modified time of a file, or zero if failure
time_t MassStorage::GetLastModifiedTime(const char *filePath) noexcept
{
FILINFO fil;
if (f_stat(filePath, &fil) == FR_OK)
{
return ConvertTimeStamp(fil.fdate, fil.ftime);
}
return 0;
}
bool MassStorage::SetLastModifiedTime(const char *filePath, time_t time) noexcept
{
const struct tm * const timeInfo = gmtime(&time);
FILINFO fno;
fno.fdate = (WORD)(((timeInfo->tm_year - 80) * 512U) | (timeInfo->tm_mon + 1) * 32U | timeInfo->tm_mday);
fno.ftime = (WORD)(timeInfo->tm_hour * 2048U | timeInfo->tm_min * 32U | timeInfo->tm_sec / 2U);
const bool ok = (f_utime(filePath, &fno) == FR_OK);
if (!ok)
{
reprap.GetPlatform().MessageF(ErrorMessage, "Failed to set last modified time for file '%s'\n", filePath);
}
return ok;
}
// Mount the specified SD card, returning true if done, false if needs to be called again.
// If an error occurs, return true with the error message in 'reply'.
// This may only be called to mount one card at a time.
GCodeResult MassStorage::Mount(size_t card, const StringRef& reply, bool reportSuccess) noexcept
{
if (card >= NumSdCards)
{
reply.copy("SD card number out of range");
return GCodeResult::error;
}
SdCardInfo& inf = info[card];
MutexLocker lock1(fsMutex);
MutexLocker lock2(inf.volMutex);
if (!inf.mounting)
{
if (inf.isMounted)
{
if (AnyFileOpen(&inf.fileSystem))
{
// Don't re-mount the card if any files are open on it
reply.copy("SD card has open file(s)");
return GCodeResult::error;
}
(void)InternalUnmount(card, false);
}
inf.mountStartTime = millis();
inf.mounting = true;
delay(2);
}
if (inf.cardState == CardDetectState::notPresent)
{
reply.copy("No SD card present");
inf.mounting = false;
return GCodeResult::error;
}
if (inf.cardState != CardDetectState::present)
{
return GCodeResult::notFinished; // wait for debounce to finish
}
const sd_mmc_err_t err = sd_mmc_check(card);
if (err != SD_MMC_OK && millis() - inf.mountStartTime < 5000)
{
delay(2);
return GCodeResult::notFinished;
}
inf.mounting = false;
if (err != SD_MMC_OK)
{
reply.printf("Cannot initialise SD card %u: %s", card, TranslateCardError(err));
return GCodeResult::error;
}
// Mount the file systems
const char path[3] = { (char)('0' + card), ':', 0 };
const FRESULT mounted = f_mount(&inf.fileSystem, path, 1);
if (mounted == FR_NO_FILESYSTEM)
{
reply.printf("Cannot mount SD card %u: no FAT filesystem found on card (EXFAT is not supported)", card);
return GCodeResult::error;
}
if (mounted != FR_OK)
{
reply.printf("Cannot mount SD card %u: code %d", card, mounted);
return GCodeResult::error;
}
inf.isMounted = true;
if (reportSuccess)
{
float capacity = ((float)sd_mmc_get_capacity(card) * 1024) / 1000000; // get capacity and convert from Kib to Mbytes
const char* capUnits;
if (capacity >= 1000.0)
{
capacity /= 1000;
capUnits = "Gb";
}
else
{
capUnits = "Mb";
}
reply.printf("%s card mounted in slot %u, capacity %.2f%s", TranslateCardType(sd_mmc_get_type(card)), card, (double)capacity, capUnits);
}
return GCodeResult::ok;
}
// Unmount the specified SD card, returning true if done, false if needs to be called again.
// If an error occurs, return true with the error message in 'reply'.
GCodeResult MassStorage::Unmount(size_t card, const StringRef& reply) noexcept
{
if (card >= NumSdCards)
{
reply.copy("SD card number out of range");
return GCodeResult::error;
}
reply.printf("SD card %u may now be removed", card);
const unsigned int numFilesClosed = InternalUnmount(card, true);
if (numFilesClosed != 0)
{
reply.catf(" (%u file(s) were closed)", numFilesClosed);
}
return GCodeResult::ok;
}
// Check if the drive referenced in the specified path is mounted. Return true if it is.
// Ideally we would try to mount it if it is not, however mounting a drive can take a long time, and the functions that call this are expected to execute quickly.
bool MassStorage::CheckDriveMounted(const char* path) noexcept
{
const size_t card = (strlen(path) >= 2 && path[1] == ':' && isDigit(path[0]))
? path[0] - '0'
: 0;
return card < NumSdCards && info[card].isMounted;
}
// Return true if any files are open on the file system
bool MassStorage::AnyFileOpen(const FATFS *fs) noexcept
{
MutexLocker lock(fsMutex);
for (const FileStore & fil : files)
{
if (fil.IsOpenOn(fs))
{
return true;
}
}
return false;
}
// Invalidate all open files on the specified file system, returning the number of files that were invalidated
unsigned int MassStorage::InvalidateFiles(const FATFS *fs, bool doClose) noexcept
{
unsigned int invalidated = 0;
MutexLocker lock(fsMutex);
for (FileStore & fil : files)
{
if (fil.Invalidate(fs, doClose))
{
++invalidated;
}
}
return invalidated;
}
bool MassStorage::IsCardDetected(size_t card) noexcept
{
return info[card].cardState == CardDetectState::present;
}
unsigned int MassStorage::GetNumFreeFiles() noexcept
{
unsigned int numFreeFiles = 0;
MutexLocker lock(fsMutex);
for (const FileStore & fil : files)
{
if (fil.IsFree())
{
++numFreeFiles;
}
}
return numFreeFiles;
}
void MassStorage::Spin() noexcept
{
for (size_t card = 0; card < NumSdCards; ++card)
{
SdCardInfo& inf = info[card];
if (inf.cdPin != NoPin)
{
if (digitalRead(inf.cdPin))
{
// Pin state says no card present
switch (inf.cardState)
{
case CardDetectState::inserting:
case CardDetectState::present:
inf.cardState = CardDetectState::removing;
inf.cdChangedTime = millis();
break;
case CardDetectState::removing:
if (millis() - inf.cdChangedTime > SdCardDetectDebounceMillis)
{
inf.cardState = CardDetectState::notPresent;
if (inf.isMounted)
{
const unsigned int numFiles = InternalUnmount(card, false);
if (numFiles != 0)
{
reprap.GetPlatform().MessageF(ErrorMessage, "SD card %u removed with %u file(s) open on it\n", card, numFiles);
}
}
}
break;
default:
break;
}
}
else
{
// Pin state says card is present
switch (inf.cardState)
{
case CardDetectState::removing:
case CardDetectState::notPresent:
inf.cardState = CardDetectState::inserting;
inf.cdChangedTime = millis();
break;
case CardDetectState::inserting:
inf.cardState = CardDetectState::present;
break;
default:
break;
}
}
}
}
// Check if any files are supposed to be closed
{
MutexLocker lock(fsMutex);
for (FileStore & fil : files)
{
if (fil.IsCloseRequested())
{
// We could not close this file in an ISR, so do it here
fil.Close();
}
}
}
}
// Append the simulated printing time to the end of the file
void MassStorage::RecordSimulationTime(const char *printingFilePath, uint32_t simSeconds) noexcept
{
FileStore * const file = OpenFile(printingFilePath, OpenMode::append, 0);
bool ok = (file != nullptr);
if (ok)
{
// Check whether there is already simulation info at the end of the file, in which case we should replace it
constexpr size_t BufferSize = 100;
String<BufferSize> buffer;
const size_t bytesToRead = (size_t)min<FilePosition>(file->Length(), BufferSize);
const FilePosition seekPos = file->Length() - bytesToRead;
ok = file->Seek(seekPos);
time_t lastModtime = 0;
if (ok)
{
ok = (file->Read(buffer.GetRef().Pointer(), bytesToRead) == (int)bytesToRead);
if (ok)
{
lastModtime = GetLastModifiedTime(printingFilePath); // save the last modified time to that we can restore it later
buffer[bytesToRead] = 0; // this is OK because String<N> has N+1 bytes of storage
const char* const pos = strstr(buffer.c_str(), FileInfoParser::SimulatedTimeString);
if (pos != nullptr)
{
ok = file->Seek(seekPos + (pos - buffer.c_str())); // overwrite previous simulation time
}
if (ok)
{
buffer.printf("%s: %" PRIu32 "\n", FileInfoParser::SimulatedTimeString, simSeconds);
ok = file->Write(buffer.c_str());
if (ok)
{
ok = file->Truncate(); // truncate file in case we overwrote a previous longer simulation time
}
}
}
}
if (!file->Close())
{
ok = false;
}
if (ok && lastModtime != 0)
{
ok = SetLastModifiedTime(printingFilePath, lastModtime);
}
}
if (!ok)
{
reprap.GetPlatform().MessageF(ErrorMessage, "Failed to append simulated print time to file %s\n", printingFilePath);
}
}
// Get information about the SD card and interface speed
MassStorage::InfoResult MassStorage::GetCardInfo(size_t slot, uint64_t& capacity, uint64_t& freeSpace, uint32_t& speed, uint32_t& clSize) noexcept
{
if (slot >= NumSdCards)
{
return InfoResult::badSlot;
}
SdCardInfo& inf = info[slot];
if (!inf.isMounted)
{
return InfoResult::noCard;
}
capacity = (uint64_t)sd_mmc_get_capacity(slot) * 1024;
speed = sd_mmc_get_interface_speed(slot);
String<ShortScratchStringLength> path;
path.printf("%u:/", slot);
uint32_t freeClusters;
FATFS *fs;
const FRESULT fr = f_getfree(path.c_str(), &freeClusters, &fs);
if (fr == FR_OK)
{
clSize = fs->csize * 512;
freeSpace = (uint64_t)freeClusters * clSize;
}
else
{
clSize = 0;
freeSpace = 0;
}
return InfoResult::ok;
}
bool MassStorage::IsDriveMounted(size_t drive) noexcept
{
return drive < NumSdCards && info[drive].isMounted;
}
const Mutex& MassStorage::GetVolumeMutex(size_t vol) noexcept
{
return info[vol].volMutex;
}
bool MassStorage::GetFileInfo(const char *filePath, GCodeFileInfo& info, bool quitEarly) noexcept
{
return infoParser.GetFileInfo(filePath, info, quitEarly);
}
// Functions called by FatFS to acquire/release mutual exclusion
extern "C"
{
// Create a sync object. We already created it, we just need to copy the handle.
int ff_cre_syncobj (BYTE vol, FF_SYNC_t* psy)
{
*psy = &MassStorage::GetVolumeMutex(vol);
return 1;
}
// Lock sync object
int ff_req_grant (FF_SYNC_t sy)
{
sy->Take();
return 1;
}
// Unlock sync object
void ff_rel_grant (FF_SYNC_t sy)
{
sy->Release();
}
// Delete a sync object
int ff_del_syncobj (FF_SYNC_t sy)
{
return 1; // nothing to do, we never delete the mutex
}
}
#endif
// End
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