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android13/hardware/st/nfc/1.0/hal/halcore.c

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/** ----------------------------------------------------------------------
*
* Copyright (C) 2016 ST Microelectronics S.A.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*
----------------------------------------------------------------------*/
#define LOG_TAG "NfcHal"
#include <hardware/nfc.h>
#include "halcore_private.h"
#include "android_logmsg.h"
#include <stdlib.h>
#include <string.h>
#include <pthread.h>
#include <semaphore.h>
extern int I2cWriteCmd(const uint8_t* x, size_t len);
extern void DispHal(const char* title, const void* data, size_t length);
extern uint32_t ScrProtocolTraceFlag; // = SCR_PROTO_TRACE_ALL;
// HAL WRAPPER
static void HalStopTimer(HalInstance* inst);
typedef struct {
struct nfc_nci_device nci_device; // nci_device must be first struct member
// below declarations are private variables within HAL
nfc_stack_callback_t* p_cback;
nfc_stack_data_callback_t* p_data_cback;
HALHANDLE hHAL;
} st21nfc_dev_t; // beware, is a duplication of structure in nfc_nci_st21nfc.c
/**************************************************************************************************
*
* Private API Declaration
*
**************************************************************************************************/
static void* HalWorkerThread(void* arg);
static inline int sem_wait_nointr(sem_t *sem);
static void HalOnNewUpstreamFrame(HalInstance* inst, const uint8_t* data,
size_t length);
static void HalTriggerNextDsPacket(HalInstance* inst);
static bool HalEnqueueThreadMessage(HalInstance* inst, ThreadMesssage* msg);
static bool HalDequeueThreadMessage(HalInstance* inst, ThreadMesssage* msg);
static HalBuffer* HalAllocBuffer(HalInstance* inst);
static HalBuffer* HalFreeBuffer(HalInstance* inst, HalBuffer* b);
static uint32_t HalSemWait(sem_t* pSemaphore, uint32_t timeout);
/**************************************************************************************************
*
* Public API Entry-Points
*
**************************************************************************************************/
/**
* Callback of HAL Core protocol layer.
* Invoked by HAL worker thread according to if message is received from NCI
* stack or posted by
* I2C worker thread.
* <p>@param context NFC callbacks for control/data
* @param event Next HAL state machine action (send msg to I2C layer or report
* data/control/error
* to NFC task)
* @param length Configure if debug and trace allowed, trace level
*/
void HalCoreCallback(void* context, uint32_t event, const void* d,
size_t length)
{
const uint8_t* data = (const uint8_t*)d;
uint8_t cmd = 'W';
st21nfc_dev_t* dev = (st21nfc_dev_t*)context;
switch (event) {
case HAL_EVENT_DSWRITE:
STLOG_HAL_V("!! got event HAL_EVENT_DSWRITE for %zu bytes\n", length);
DispHal("TX DATA", (data), length);
// Send write command to IO thread
cmd = 'W';
I2cWriteCmd(&cmd, sizeof(cmd));
I2cWriteCmd((const uint8_t*)&length, sizeof(length));
I2cWriteCmd(data, length);
break;
case HAL_EVENT_DATAIND:
STLOG_HAL_V("!! got event HAL_EVENT_DATAIND for %zu bytes\n", length);
if ((length >= 3) && (data[2] != (length - 3))) {
STLOG_HAL_W("length is illogical. Header length is %d, packet length %zu\n",
data[2], length);
}
dev->p_data_cback(length, (uint8_t*)data);
break;
case HAL_EVENT_ERROR:
STLOG_HAL_E("!! got event HAL_EVENT_ERROR\n");
DispHal("Received unexpected HAL message !!!", data, length);
break;
case HAL_EVENT_LINKLOST:
STLOG_HAL_E("!! got event HAL_EVENT_LINKLOST or HAL_EVENT_ERROR\n");
dev->p_cback(HAL_NFC_ERROR_EVT, HAL_NFC_STATUS_ERR_CMD_TIMEOUT);
// Write terminate command
cmd = 'X';
I2cWriteCmd(&cmd, sizeof(cmd));
break;
case HAL_EVENT_TIMER_TIMEOUT:
STLOG_HAL_D("!! got event HAL_EVENT_TIMER_TIMEOUT \n");
dev->p_cback(HAL_WRAPPER_TIMEOUT_EVT, HAL_NFC_STATUS_OK);
// dev->p_data_cback(0, NULL);
break;
}
}
/**
* Connection to the HAL Core layer.
* Set-up HAL context and create HAL worker thread.
* <p>@param context NFC NCI device context, NFC callbacks for control/data, HAL
* handle
* @param callback HAL callback function pointer
* @param flags Configure if debug and trace allowed, trace level
*/
HALHANDLE HalCreate(void* context, HAL_CALLBACK callback, uint32_t flags)
{
halTraceMask = true;
if (flags & HAL_FLAG_NO_DEBUG) {
halTraceMask = false;
}
STLOG_HAL_V("HalCreate enter\n");
HalInstance* inst = calloc(1, sizeof(HalInstance));
if (!inst) {
STLOG_HAL_E("!out of memory\n");
return NULL;
}
// We need a semaphore to wakeup our protocol thread
if (0 != sem_init(&inst->semaphore, 0, 0)) {
STLOG_HAL_E("!sem_init failed\n");
free(inst);
return NULL;
}
// We need a semaphore to manage buffers
if (0 != sem_init(&inst->bufferResourceSem, 0, NUM_BUFFERS)) {
STLOG_HAL_E("!sem_init failed\n");
sem_destroy(&inst->semaphore);
free(inst);
return NULL;
}
// We need a semaphore to block upstream data indications
if (0 != sem_init(&inst->upstreamBlock, 0, 0)) {
STLOG_HAL_E("!sem_init failed\n");
sem_destroy(&inst->semaphore);
sem_destroy(&inst->bufferResourceSem);
free(inst);
return NULL;
}
// Initialize remaining data-members
inst->context = context;
inst->callback = callback;
inst->flags = flags;
inst->freeBufferList = 0;
inst->pendingNciList = 0;
inst->nciBuffer = 0;
inst->ringReadPos = 0;
inst->ringWritePos = 0;
inst->timeout = HAL_SLEEP_TIMER_DURATION;
inst->bufferData = calloc(NUM_BUFFERS, sizeof(HalBuffer));
if (!inst->bufferData) {
STLOG_HAL_E("!failed to allocate memory\n");
sem_destroy(&inst->semaphore);
sem_destroy(&inst->bufferResourceSem);
sem_destroy(&inst->upstreamBlock);
free(inst);
return NULL;
}
// Concatenate the buffers into a linked list for easy access
size_t i;
for (i = 0; i < NUM_BUFFERS; i++) {
HalBuffer* b = &inst->bufferData[i];
b->next = inst->freeBufferList;
inst->freeBufferList = b;
}
if (0 != pthread_mutex_init(&inst->hMutex, 0))
{
STLOG_HAL_E("!failed to initialize Mutex \n");
sem_destroy(&inst->semaphore);
sem_destroy(&inst->bufferResourceSem);
sem_destroy(&inst->upstreamBlock);
free(inst->bufferData);
free(inst);
return NULL;
}
// Spawn the thread
if (0 != pthread_create(&inst->thread, NULL, HalWorkerThread, inst)) {
STLOG_HAL_E("!failed to spawn workerthread \n");
sem_destroy(&inst->semaphore);
sem_destroy(&inst->bufferResourceSem);
sem_destroy(&inst->upstreamBlock);
pthread_mutex_destroy(&inst->hMutex);
free(inst->bufferData);
free(inst);
return NULL;
}
STLOG_HAL_V("HalCreate exit\n");
return (HALHANDLE)inst;
}
/**
* Disconnection of the HAL protocol layer.
* Send message to stop the HAL worker thread and wait for it to finish. Free
* resources.
* @param hHAL HAL handle
*/
void HalDestroy(HALHANDLE hHAL)
{
HalInstance* inst = (HalInstance*)hHAL;
// Tell the thread that we want to finish
ThreadMesssage msg;
msg.command = MSG_EXIT_REQUEST;
msg.payload = 0;
msg.length = 0;
HalEnqueueThreadMessage(inst, &msg);
// Wait for thread to finish
pthread_join(inst->thread, NULL);
// Cleanup and exit
sem_destroy(&inst->semaphore);
sem_destroy(&inst->upstreamBlock);
sem_destroy(&inst->bufferResourceSem);
pthread_mutex_destroy(&inst->hMutex);
// Free resources
free(inst->bufferData);
free(inst);
STLOG_HAL_V("HalDestroy done\n");
}
/**
* Send an NCI message downstream to HAL protocol layer (DH->NFCC transfer).
* Block if more than NUM_BUFFERS (10) transfers are outstanding, otherwise will return immediately.
* @param hHAL HAL handle
* @param data Data message
* @param size Message size
*/ bool HalSendDownstream(HALHANDLE hHAL, const uint8_t* data, size_t size)
{
// Send an NCI frame downstream. will
HalInstance* inst = (HalInstance*)hHAL;
if ((size <= MAX_BUFFER_SIZE) && (size > 0)) {
ThreadMesssage msg;
HalBuffer* b = HalAllocBuffer(inst);
if (!b) {
// Should never be reachable
return false;
}
memcpy(b->data, data, size);
b->length = size;
msg.command = MSG_TX_DATA;
msg.payload = 0;
msg.length = 0;
msg.buffer = b;
return HalEnqueueThreadMessage(inst, &msg);
} else {
STLOG_HAL_E("HalSendDownstream size to large %zu instead of %d\n", size,
MAX_BUFFER_SIZE);
return false;
}
}
// HAL WRAPPER
/**
* Send an NCI message downstream to HAL protocol layer (DH->NFCC transfer).
* Block if more than NUM_BUFFERS (10) transfers are outstanding, otherwise will return immediately.
* @param hHAL HAL handle
* @param data Data message
* @param size Message size
*/ bool HalSendDownstreamTimer(HALHANDLE hHAL, const uint8_t* data,
size_t size, uint8_t duration)
{
// Send an NCI frame downstream. will
HalInstance* inst = (HalInstance*)hHAL;
if ((size <= MAX_BUFFER_SIZE) && (size > 0)) {
ThreadMesssage msg;
HalBuffer* b = HalAllocBuffer(inst);
if (!b) {
// Should never be reachable
return false;
}
memcpy(b->data, data, size);
b->length = size;
msg.command = MSG_TX_DATA_TIMER_START;
msg.payload = 0;
msg.length = duration;
msg.buffer = b;
return HalEnqueueThreadMessage(inst, &msg);
} else {
STLOG_HAL_E("HalSendDownstreamTimer size to large %zu instead of %d\n", size,
MAX_BUFFER_SIZE);
return false;
}
}
/**
* Send an NCI message downstream to HAL protocol layer (DH->NFCC transfer).
* Block if more than NUM_BUFFERS (10) transfers are outstanding, otherwise will
* return immediately.
* @param hHAL HAL handle
* @param data Data message
* @param size Message size
*/
bool HalSendDownstreamStopTimer(HALHANDLE hHAL)
{
// Send an NCI frame downstream. will
HalInstance* inst = (HalInstance*)hHAL;
HalStopTimer(inst);
return 1;
}
/**
* Send an NCI message upstream to NFC NCI layer (NFCC->DH transfer).
* @param hHAL HAL handle
* @param data Data message
* @param size Message size
*/ bool HalSendUpstream(HALHANDLE hHAL, const uint8_t* data, size_t size)
{
HalInstance* inst = (HalInstance*)hHAL;
if ((size <= MAX_BUFFER_SIZE) && (size > 0)) {
ThreadMesssage msg;
msg.command = MSG_RX_DATA;
msg.payload = data;
msg.length = size;
if (HalEnqueueThreadMessage(inst, &msg)) {
// Block until the protocol has taken a copy of the data
sem_wait_nointr(&inst->upstreamBlock);
return true;
}
return false;
} else {
STLOG_HAL_E("HalSendUpstream size to large %zu instead of %d\n", size,
MAX_BUFFER_SIZE);
return false;
}
}
/**************************************************************************************************
*
* Private API Definition
*
**************************************************************************************************/
/*
* Get current time stamp
*/
struct timespec HalGetTimestamp(void)
{
struct timespec tm;
clock_gettime(CLOCK_REALTIME, &tm);
return tm;
}
int HalTimeDiffInMs(struct timespec start, struct timespec end)
{
struct timespec temp;
if ((end.tv_nsec - start.tv_nsec) < 0) {
temp.tv_sec = end.tv_sec - start.tv_sec - 1;
temp.tv_nsec = 1000000000 + end.tv_nsec - start.tv_nsec;
} else {
temp.tv_sec = end.tv_sec - start.tv_sec;
temp.tv_nsec = end.tv_nsec - start.tv_nsec;
}
return (temp.tv_nsec / 1000000) + (temp.tv_sec * 1000);
}
/**
* Determine the next shortest sleep to fulfill the pending timer requirements.
* @param inst HAL instance
* @param now timespec structure for time definition
*/
static uint32_t HalCalcSemWaitingTime(HalInstance* inst, struct timespec* now)
{
// Default to infinite wait time
uint32_t result = OS_SYNC_INFINITE;
if (inst->timer.active) {
int delta =
inst->timer.duration - HalTimeDiffInMs(inst->timer.startTime, *now);
if (delta < 0) {
// If we have a timer that has already expired, pick a zero wait time
result = 0;
} else if ((uint32_t)delta < result) {
// Smaller time difference? If so take it
result = delta;
}
}
if (result != OS_SYNC_INFINITE) {
// Add one millisecond on top of that, so the waiting semaphore will time
// out just a moment
// after the timer should expire
result += 1;
}
return result;
}
/**************************************************************************************************
*
* Timer Management
*
**************************************************************************************************/
static void HalStopTimer(HalInstance* inst)
{
inst->timer.active = false;
STLOG_HAL_D("HalStopTimer \n");
}
static void HalStartTimer(HalInstance* inst, uint32_t duration)
{
STLOG_HAL_D("HalStartTimer \n");
inst->timer.startTime = HalGetTimestamp();
inst->timer.active = true;
inst->timer.duration = duration;
}
/**************************************************************************************************
*
* Thread Message Queue
*
**************************************************************************************************/
/**
* Write message pointer to small ring buffer for queuing HAL messages.
* @param inst HAL instance
* @param msg Message to send
* @return true if message properly copied in ring buffer
*/
static bool HalEnqueueThreadMessage(HalInstance* inst, ThreadMesssage* msg)
{
// Put a message to the queue
int nextWriteSlot;
bool result = true;
pthread_mutex_lock(&inst->hMutex);
nextWriteSlot = inst->ringWritePos + 1;
if (nextWriteSlot == HAL_QUEUE_MAX) {
nextWriteSlot = 0;
}
// Check that we don't overflow the queue entries
if (nextWriteSlot == inst->ringReadPos) {
STLOG_HAL_E("HAL thread message ring: RNR (implement me!!)");
result = false;
}
if (result) {
// inst->ring[nextWriteSlot] = *msg;
memcpy(&(inst->ring[nextWriteSlot]), msg, sizeof(ThreadMesssage));
inst->ringWritePos = nextWriteSlot;
}
pthread_mutex_unlock(&inst->hMutex);
if (result) {
sem_post(&inst->semaphore);
}
return result;
}
/**
* Remove message pointer from stored ring buffer.
* @param inst HAL instance
* @param msg Message received
* @return true if there is a new message to pull, false otherwise.
*/
static bool HalDequeueThreadMessage(HalInstance* inst, ThreadMesssage* msg)
{
int nextCmdIndex;
bool result = true;
// New data available
pthread_mutex_lock(&inst->hMutex);
// Get new timer read index
nextCmdIndex = inst->ringReadPos + 1;
if (nextCmdIndex == HAL_QUEUE_MAX) {
nextCmdIndex = 0;
}
//check if ring buffer is empty
if (inst->ringReadPos == inst->ringWritePos)
{
STLOG_HAL_E("HAL thread message ring: already read last valid data");
result = false;
}
// Get new element from ringbuffer
if (result) {
memcpy(msg, &(inst->ring[nextCmdIndex]), sizeof(ThreadMesssage));
inst->ringReadPos = nextCmdIndex;
}
pthread_mutex_unlock(&inst->hMutex);
return result;
}
/**************************************************************************************************
*
* Buffer/Memory Management
*
**************************************************************************************************/
/**
* Allocate buffer from pre-allocated pool.
* @param inst HAL instance
* @return Pointer to allocated HAL buffer
*/
static HalBuffer* HalAllocBuffer(HalInstance* inst)
{
HalBuffer* b;
// Wait until we have a buffer resource
sem_wait_nointr(&inst->bufferResourceSem);
pthread_mutex_lock(&inst->hMutex);
b = inst->freeBufferList;
if (b) {
inst->freeBufferList = b->next;
b->next = 0;
}
pthread_mutex_unlock(&inst->hMutex);
if (!b) {
STLOG_HAL_E(
"! unable to allocate buffer resource."
"check bufferResourceSem\n");
}
return b;
}
/**
* Return buffer to pool.
* @param inst HAL instance
* @param b Pointer of HAL buffer to free
* @return Pointer of freed HAL buffer
*/
static HalBuffer* HalFreeBuffer(HalInstance* inst, HalBuffer* b)
{
pthread_mutex_lock(&inst->hMutex);
b->next = inst->freeBufferList;
inst->freeBufferList = b;
pthread_mutex_unlock(&inst->hMutex);
// Unblock treads waiting for a buffer
sem_post(&inst->bufferResourceSem);
return b;
}
/**************************************************************************************************
*
* State Machine
*
**************************************************************************************************/
/**
* Event handler for HAL message
* @param inst HAL instance
* @param e HAL event
*/
static void Hal_event_handler(HalInstance* inst, HalEvent e)
{
switch (e) {
case EVT_RX_DATA: {
// New data packet arrived
const uint8_t* nciData;
size_t nciLength;
// Extract raw NCI data from frame
nciData = inst->lastUsFrame;
nciLength = inst->lastUsFrameSize;
// Pass received raw NCI data to stack
inst->callback(inst->context, HAL_EVENT_DATAIND, nciData, nciLength);
}
break;
case EVT_TX_DATA:
// NCI data arrived from stack
// Send data
inst->callback(inst->context, HAL_EVENT_DSWRITE, inst->nciBuffer->data,
inst->nciBuffer->length);
// Free the buffer
HalFreeBuffer(inst, inst->nciBuffer);
inst->nciBuffer = 0;
break;
// HAL WRAPPER
case EVT_TIMER:
inst->callback(inst->context, HAL_EVENT_TIMER_TIMEOUT, NULL, 0);
break;
}
}
/**************************************************************************************************
*
* HAL Worker Thread
*
**************************************************************************************************/
/**
* HAL worker thread to serialize all actions into a single thread.
* RX/TX/TIMER are dispatched from here.
* @param arg HAL instance arguments
*/
static void* HalWorkerThread(void* arg)
{
HalInstance* inst = (HalInstance*)arg;
inst->exitRequest = false;
STLOG_HAL_V("thread running\n");
while (!inst->exitRequest) {
struct timespec now = HalGetTimestamp();
uint32_t waitResult =
HalSemWait(&inst->semaphore, HalCalcSemWaitingTime(inst, &now));
switch (waitResult) {
case OS_SYNC_TIMEOUT: {
// One or more times have expired
STLOG_HAL_W("OS_SYNC_TIMEOUT\n");
now = HalGetTimestamp();
// HAL WRAPPER
// callback to hal wrapper
// Unblock
sem_post(&inst->upstreamBlock);
// Data frame
Hal_event_handler(inst, EVT_TIMER);
}
break;
case OS_SYNC_RELEASED: {
// A message arrived
ThreadMesssage msg;
if (HalDequeueThreadMessage(inst, &msg)) {
switch (msg.command) {
case MSG_EXIT_REQUEST:
STLOG_HAL_V("received exit request from upper layer\n");
inst->exitRequest = true;
break;
case MSG_TX_DATA:
STLOG_HAL_V("received new NCI data from stack\n");
// Attack to end of list
if (!inst->pendingNciList) {
inst->pendingNciList = msg.buffer;
inst->pendingNciList->next = 0;
} else {
// Find last element of the list. b->next is zero for this
// element
HalBuffer* b;
for (b = inst->pendingNciList; b->next; b = b->next) {
};
// Concatenate to list
b->next = msg.buffer;
msg.buffer->next = 0;
}
// Start transmitting if we're in the correct state
HalTriggerNextDsPacket(inst);
break;
// HAL WRAPPER
case MSG_TX_DATA_TIMER_START:
STLOG_HAL_V("received new NCI data from stack, need timer start\n");
// Attack to end of list
if (!inst->pendingNciList) {
inst->pendingNciList = msg.buffer;
inst->pendingNciList->next = 0;
} else {
// Find last element of the list. b->next is zero for this
// element
HalBuffer* b;
for (b = inst->pendingNciList; b->next; b = b->next) {
};
// Concatenate to list
b->next = msg.buffer;
msg.buffer->next = 0;
}
// Start timer
HalStartTimer(inst, msg.length);
// Start transmitting if we're in the correct state
HalTriggerNextDsPacket(inst);
break;
case MSG_RX_DATA:
STLOG_HAL_D("received new data from CLF\n");
HalOnNewUpstreamFrame(inst, msg.payload, msg.length);
break;
default:
STLOG_HAL_E("!received unkown thread message?\n");
break;
}
} else {
STLOG_HAL_E("!got wakeup in workerthread, but no message here? ?\n");
}
}
break;
case OS_SYNC_FAILED:
STLOG_HAL_E(
"!Something went horribly wrong.. The semaphore wait function "
"failed\n");
inst->exitRequest = true;
break;
}
}
STLOG_HAL_D("thread about to exit\n");
return NULL;
}
/**************************************************************************************************
*
* Misc. Functions
*
**************************************************************************************************/
/**
* helper to make sem_t interrupt safe
* @param sem_t semaphore
* @return sem_wait return value.
*/
static inline int sem_wait_nointr(sem_t *sem) {
while (sem_wait(sem))
if (errno == EINTR) errno = 0;
else return -1;
return 0;
}
/**
* Handle RX frames here first in HAL context.
* @param inst HAL instance
* @param data HAL data received from I2C worker thread
* @param length Size of HAL data
*/
static void HalOnNewUpstreamFrame(HalInstance* inst, const uint8_t* data,
size_t length)
{
memcpy(inst->lastUsFrame, data, length);
inst->lastUsFrameSize = length;
// Data frame
Hal_event_handler(inst, EVT_RX_DATA);
// Allow the I2C thread to get the next message (if done early, it may
// overwrite before handled)
sem_post(&inst->upstreamBlock);
}
/**
* Send out the next queued up buffer for TX if any.
* @param inst HAL instance
*/
static void HalTriggerNextDsPacket(HalInstance* inst)
{
// Check if we have something to transmit downstream
HalBuffer* b = inst->pendingNciList;
if (b) {
// Get the buffer from the pending list
inst->pendingNciList = b->next;
inst->nciBuffer = b;
STLOG_HAL_V("trigger transport of next NCI data downstream\n");
// Process the new nci frame
Hal_event_handler(inst, EVT_TX_DATA);
} else {
STLOG_HAL_V("no new NCI data to transmit, enter wait..\n");
}
}
/*
* Wait for given semaphore signaling a specific time or ever
* param sem_t * pSemaphore
* param uint32_t timeout
* return uint32_t
*/
static uint32_t HalSemWait(sem_t* pSemaphore, uint32_t timeout)
{
uint32_t result = OS_SYNC_RELEASED;
bool gotResult = false;
if (timeout == OS_SYNC_INFINITE) {
while (!gotResult) {
if (sem_wait(pSemaphore) == -1) {
int e = errno;
char msg[200];
if (e == EINTR) {
STLOG_HAL_W(
"! semaphore (infin) wait interrupted by system signal. re-enter "
"wait");
continue;
}
strerror_r(e, msg, sizeof(msg) - 1);
STLOG_HAL_E("! semaphore (infin) wait failed. sem=0x%p, %s", pSemaphore, msg);
gotResult = true;
result = OS_SYNC_FAILED;
} else {
gotResult = true;
}
};
} else {
struct timespec tm;
long oneSecInNs = (int)1e9;
clock_gettime(CLOCK_REALTIME, &tm);
/* add timeout (can't overflow): */
tm.tv_sec += (timeout / 1000);
tm.tv_nsec += ((timeout % 1000) * 1000000);
/* make sure nanoseconds are below a million */
if (tm.tv_nsec >= oneSecInNs) {
tm.tv_sec++;
tm.tv_nsec -= oneSecInNs;
}
while (!gotResult) {
if (sem_timedwait(pSemaphore, &tm) == -1) {
int e = errno;
if (e == EINTR) {
/* interrupted by signal? repeat sem_wait again */
continue;
}
if (e == ETIMEDOUT) {
result = OS_SYNC_TIMEOUT;
gotResult = true;
} else {
result = OS_SYNC_FAILED;
gotResult = true;
}
} else {
gotResult = true;
}
}
}
return result;
}
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