Squashed commit of the following:

sched/semaphore:  Add nxsem_post() which is identical to sem_post() except that it never modifies the errno variable.  Changed all references to sem_post in the OS to nxsem_post().

    sched/semaphore:  Add nxsem_destroy() which is identical to sem_destroy() except that it never modifies the errno variable.  Changed all references to sem_destroy() in the OS to nxsem_destroy().

    libc/semaphore and sched/semaphore:  Add nxsem_getprotocol() and nxsem_setprotocola which are identical to sem_getprotocol() and set_setprotocol() except that they never modifies the errno variable.  Changed all references to sem_setprotocol in the OS to nxsem_setprotocol().  sem_getprotocol() was not used in the OS

arch/arm/src/efm32/efm32_dma.c

@@ -381,7 +381,7 @@ DMA_HANDLE efm32_dmachannel(void)
         }
     }
 
-  sem_post(&g_dmac.exclsem);
+  nxsem_post(&g_dmac.exclsem);
 
   /* Since we have reserved a DMA descriptor by taking a count from chansem,
    * it would be a serious logic failure if we could not find a free channel
@@ -432,7 +432,7 @@ void efm32_dmafree(DMA_HANDLE handle)
    * thread that may be waiting for a channel.
    */
 
-  sem_post(&g_dmac.chansem);
+  nxsem_post(&g_dmac.chansem);
 }
 
 /****************************************************************************

arch/arm/src/efm32/efm32_i2c.c

@@ -660,7 +660,7 @@ static inline int efm32_i2c_sem_waitdone(FAR struct efm32_i2c_priv_s *priv)
 
 static inline void efm32_i2c_sem_post(FAR struct efm32_i2c_priv_s *priv)
 {
-  sem_post(&priv->sem_excl);
+  nxsem_post(&priv->sem_excl);
 }
 
 /****************************************************************************
@@ -681,7 +681,7 @@ static inline void efm32_i2c_sem_init(FAR struct efm32_i2c_priv_s *priv)
    */
 
   nxsem_init(&priv->sem_isr, 0, 0);
-  sem_setprotocol(&priv->sem_isr, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->sem_isr, SEM_PRIO_NONE);
 #endif
 }
 
@@ -695,9 +695,9 @@ static inline void efm32_i2c_sem_init(FAR struct efm32_i2c_priv_s *priv)
 
 static inline void efm32_i2c_sem_destroy(FAR struct efm32_i2c_priv_s *priv)
 {
-  sem_destroy(&priv->sem_excl);
+  nxsem_destroy(&priv->sem_excl);
 #ifndef CONFIG_I2C_POLLED
-  sem_destroy(&priv->sem_isr);
+  nxsem_destroy(&priv->sem_isr);
 #endif
 }
 
@@ -1254,7 +1254,7 @@ done:
   if (priv->i2c_state == I2CSTATE_DONE)
     {
 #ifndef CONFIG_I2C_POLLED
-      sem_post(&priv->sem_isr);
+      nxsem_post(&priv->sem_isr);
 #endif
       /* Disable interrupt sources when done */
 

arch/arm/src/efm32/efm32_spi.c

@@ -510,7 +510,7 @@ static void spi_dmatxwait(struct efm32_spidev_s *priv)
 #ifdef CONFIG_EFM32_SPI_DMA
 static inline void spi_dmarxwakeup(struct efm32_spidev_s *priv)
 {
-  (void)sem_post(&priv->rxdmasem);
+  (void)nxsem_post(&priv->rxdmasem);
 }
 #endif
 
@@ -525,7 +525,7 @@ static inline void spi_dmarxwakeup(struct efm32_spidev_s *priv)
 #ifdef CONFIG_EFM32_SPI_DMA
 static inline void spi_dmatxwakeup(struct efm32_spidev_s *priv)
 {
-  (void)sem_post(&priv->txdmasem);
+  (void)nxsem_post(&priv->txdmasem);
 }
 #endif
 
@@ -759,7 +759,7 @@ static int spi_lock(struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
 
   return OK;
@@ -1646,8 +1646,8 @@ static int spi_portinitialize(struct efm32_spidev_s *priv)
    * priority inheritance enabled.
    */
 
-   sem_setprotocol(&priv->rxdmasem, SEM_PRIO_NONE);
-   sem_setprotocol(&priv->txdmasem, SEM_PRIO_NONE);
+   nxsem_setprotocol(&priv->rxdmasem, SEM_PRIO_NONE);
+   nxsem_setprotocol(&priv->txdmasem, SEM_PRIO_NONE);
 #endif
 
   /* Enable SPI */

arch/arm/src/efm32/efm32_usbhost.c

@@ -319,7 +319,7 @@ static inline void efm32_modifyreg(uint32_t addr, uint32_t clrbits,
 /* Semaphores ******************************************************************/
 
 static void efm32_takesem(sem_t *sem);
-#define efm32_givesem(s) sem_post(s);
+#define efm32_givesem(s) nxsem_post(s);
 
 /* Byte stream access helper functions *****************************************/
 
@@ -5162,7 +5162,7 @@ static inline void efm32_sw_initialize(FAR struct efm32_usbhost_s *priv)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->pscsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->pscsem, SEM_PRIO_NONE);
 
   /* Initialize the driver state data */
 
@@ -5187,7 +5187,7 @@ static inline void efm32_sw_initialize(FAR struct efm32_usbhost_s *priv)
        */
 
       nxsem_init(&chan->waitsem,  0, 0);
-      sem_setprotocol(&chan->waitsem, SEM_PRIO_NONE);
+      nxsem_setprotocol(&chan->waitsem, SEM_PRIO_NONE);
     }
 }
 

arch/arm/src/imx1/imx_spi.c

@@ -678,7 +678,7 @@ static int spi_interrupt(int irq, void *context, FAR void *arg, FAR void *arg)
     {
       /* Yes, wake up the waiting thread */
 
-      sem_post(&priv->waitsem);
+      nxsem_post(&priv->waitsem);
     }
 
   return OK;
@@ -725,7 +725,7 @@ static int spi_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
 
   return OK;
@@ -1123,7 +1123,7 @@ FAR struct spi_dev_s *imx_spibus_initialize(int port)
    */
 
    nxsem_init(&priv->waitsem, 0, 0);
-   sem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
+   nxsem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
 #endif
    nxsem_init(&priv->exclsem, 0, 1);
 

arch/arm/src/imx6/imx_ecspi.c

@@ -763,7 +763,7 @@ static int spi_interrupt(int irq, void *context, FAR void *arg)
     {
       /* Yes, wake up the waiting thread */
 
-      sem_post(&priv->waitsem);
+      nxsem_post(&priv->waitsem);
     }
 
   return OK;
@@ -810,7 +810,7 @@ static int spi_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
 
   return OK;
@@ -1309,7 +1309,7 @@ FAR struct spi_dev_s *imx_spibus_initialize(int port)
    */
 
    nxsem_init(&priv->waitsem, 0, 0);
-   sem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
+   nxsem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
 #endif
    nxsem_init(&priv->exclsem, 0, 1);
 

arch/arm/src/imx6/imx_serial.c

@@ -995,7 +995,7 @@ int up_putc(int ch)
 
   if (locked)
     {
-      sem_post(&g_putc_lock);
+      nxsem_post(&g_putc_lock);
     }
 
   return ch;

arch/arm/src/kinetis/kinetis_i2c.c

@@ -323,7 +323,7 @@ static inline void kinetis_i2c_sem_init(FAR struct kinetis_i2cdev_s *priv)
    */
 
   nxsem_init(&priv->wait, 0, 0);
-  sem_setprotocol(&priv->wait, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->wait, SEM_PRIO_NONE);
 }
 
 /************************************************************************************
@@ -336,8 +336,8 @@ static inline void kinetis_i2c_sem_init(FAR struct kinetis_i2cdev_s *priv)
 
 static inline void kinetis_i2c_sem_destroy(FAR struct kinetis_i2cdev_s *priv)
 {
-  sem_destroy(&priv->mutex);
-  sem_destroy(&priv->wait);
+  nxsem_destroy(&priv->mutex);
+  nxsem_destroy(&priv->wait);
 }
 
 /************************************************************************************
@@ -366,7 +366,7 @@ static inline void kinetis_i2c_sem_wait(FAR struct kinetis_i2cdev_s *priv)
 
 static inline void kinetis_i2c_sem_post(struct kinetis_i2cdev_s *priv)
 {
-  sem_post(&priv->mutex);
+  nxsem_post(&priv->mutex);
 }
 
 /************************************************************************************
@@ -392,7 +392,7 @@ static inline void kinetis_i2c_wait(struct kinetis_i2cdev_s *priv)
 
 static inline void kinetis_i2c_endwait(struct kinetis_i2cdev_s *priv)
 {
-  sem_post(&priv->wait);
+  nxsem_post(&priv->wait);
 }
 
 /************************************************************************************

arch/arm/src/kinetis/kinetis_sdhc.c

@@ -245,7 +245,7 @@ struct kinetis_sdhcregs_s
 /* Low-level helpers ********************************************************/
 
 static void kinetis_takesem(struct kinetis_dev_s *priv);
-#define     kinetis_givesem(priv) (sem_post(&priv->waitsem))
+#define     kinetis_givesem(priv) (nxsem_post(&priv->waitsem))
 static void kinetis_configwaitints(struct kinetis_dev_s *priv, uint32_t waitints,
               sdio_eventset_t waitevents, sdio_eventset_t wkupevents);
 static void kinetis_configxfrints(struct kinetis_dev_s *priv, uint32_t xfrints);
@@ -2813,7 +2813,7 @@ FAR struct sdio_dev_s *sdhc_initialize(int slotno)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
 
   /* Create a watchdog timer */
 

arch/arm/src/kinetis/kinetis_spi.c

@@ -599,7 +599,7 @@ static int spi_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
 
   return OK;

arch/arm/src/kl/kl_spi.c

@@ -251,7 +251,7 @@ static int spi_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
   return OK;
 }

arch/arm/src/lc823450/lc823450_adc.c

@@ -298,7 +298,7 @@ static inline void lc823450_adc_sem_wait(FAR struct lc823450_adc_inst_s *inst)
 
 static inline void lc823450_adc_sem_post(FAR struct lc823450_adc_inst_s *inst)
 {
-  sem_post(&inst->sem_excl);
+  nxsem_post(&inst->sem_excl);
 }
 
 /****************************************************************************
@@ -315,7 +315,7 @@ static int lc823450_adc_isr(int irq, void *context, FAR void *arg)
   ainfo("interrupt\n");
 
   lc823450_adc_clearirq();
-  sem_post(&g_inst->sem_isr);
+  nxsem_post(&g_inst->sem_isr);
   return OK;
 }
 #endif

arch/arm/src/lc823450/lc823450_i2c.c

@@ -276,7 +276,7 @@ static inline void lc823450_i2c_sem_wait(FAR struct lc823450_i2c_priv_s *priv)
 
 static inline void lc823450_i2c_sem_post(FAR struct lc823450_i2c_priv_s *priv)
 {
-  sem_post(&priv->sem_excl);
+  nxsem_post(&priv->sem_excl);
 }
 
 /****************************************************************************
@@ -714,7 +714,7 @@ static int lc823450_i2c_poll(FAR struct lc823450_i2c_priv_s *priv)
       priv->irqstate = IRQSTATE_DONE;
 
 #ifndef CONFIG_I2C_POLLED
-      sem_post(&priv->sem_isr);
+      nxsem_post(&priv->sem_isr);
 #endif
     }
 
@@ -1184,9 +1184,9 @@ int lc823450_i2cbus_uninitialize(FAR struct i2c_master_s *dev)
 
   /* Release unused resources */
 
-  sem_destroy(&priv->sem_excl);
+  nxsem_destroy(&priv->sem_excl);
 #ifndef CONFIG_I2C_POLLED
-  sem_destroy(&priv->sem_isr);
+  nxsem_destroy(&priv->sem_isr);
 #endif
 
   return OK;

arch/arm/src/lc823450/lc823450_mtd.c

@@ -154,7 +154,7 @@ static void mtd_semtake(FAR sem_t *sem)
 
 static void mtd_semgive(FAR sem_t *sem)
 {
-  sem_post(sem);
+  nxsem_post(sem);
 }
 
 /****************************************************************************
@@ -535,7 +535,7 @@ static FAR struct mtd_dev_s *lc823450_mtd_allocdev(uint32_t channel)
   if (ret != OK)
     {
       finfo("ERROR: Failed to initialize media\n");
-      sem_destroy(&priv->sem);
+      nxsem_destroy(&priv->sem);
       kmm_free(priv);
       return NULL;
     }
@@ -799,7 +799,7 @@ int lc823450_mtd_uninitialize(uint32_t devno)
   ret = lc823450_sdc_finalize(ch);
   DEBUGASSERT(ret == OK);
 
-  sem_destroy(&priv->sem);
+  nxsem_destroy(&priv->sem);
 
   kmm_free(g_mtdmaster[ch]);
 

arch/arm/src/lc823450/lc823450_sdc.c

@@ -150,7 +150,7 @@ static void _sdc_semtake(FAR sem_t *sem)
 
 static void _sdc_semgive(FAR sem_t *sem)
 {
-  sem_post(sem);
+  nxsem_post(sem);
 }
 
 /****************************************************************************

arch/arm/src/lc823450/lc823450_sddrv_dep.c

@@ -121,7 +121,7 @@ static int _get_ch_from_cfg(struct SdDrCfg_s *cfg)
 static void dma_callback(DMA_HANDLE hdma, void *arg, int result)
 {
   sem_t *waitsem = (sem_t *)arg;
-  sem_post(waitsem);
+  nxsem_post(waitsem);
 }
 #endif /* CONFIG_LC823450_SDC_DMA */
 

arch/arm/src/lc823450/lc823450_serial.c

@@ -1078,7 +1078,7 @@ static void uart_dma_callback(DMA_HANDLE hdma, void *arg, int result)
   struct uart_dev_s *dev = (struct uart_dev_s *)arg;
   struct up_dev_s *priv = (struct up_dev_s *)dev->priv;
   sem_t *waitsem = &priv->txdma_wait;
-  sem_post(waitsem);
+  nxsem_post(waitsem);
   uart_datasent(dev);
 }
 
@@ -1214,7 +1214,7 @@ retry:
       int i;
       for (i = 0; i < buflen; i++)
         up_serialout(priv, UART_USTF, buf[i]);
-      sem_post(&priv->txdma_wait);
+      nxsem_post(&priv->txdma_wait);
       return buflen;
     }
 

arch/arm/src/lc823450/lc823450_spi.c

@@ -165,7 +165,7 @@ static int spi_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
 
   return OK;
@@ -320,7 +320,7 @@ static void spi_setbits(FAR struct spi_dev_s *dev, int nbits)
 static void spi_dma_callback(DMA_HANDLE hdma, void *arg, int result)
 {
   sem_t *waitsem = (sem_t *)arg;
-  sem_post(waitsem);
+  nxsem_post(waitsem);
 }
 #endif /* CONFIG_LC823450_SPI_DMA */
 

arch/arm/src/lc823450/lc823450_timerisr.c

@@ -193,7 +193,7 @@ cont:
       if (tmp->usec <= 0)
         {
           dq_rem(pent, &hrt_timer_queue);
-          sem_post(&tmp->sem);
+          nxsem_post(&tmp->sem);
           goto cont;
         }
       else

arch/arm/src/lc823450/lc823450_usbdev.c

@@ -540,7 +540,7 @@ static int lc823450_epdisable(struct usbdev_ep_s *ep)
   g_usbdev.bufoffset = 0x180;
   privep->disable = 1;
   lc823450_dmastop(hdma);
-  sem_post(&dma_wait);
+  nxsem_post(&dma_wait);
   return lc823450_epclearreq(ep);
 }
 
@@ -1720,7 +1720,7 @@ void usbdev_msc_read_exit()
 static void usbdev_dma_callback(DMA_HANDLE hd, void *arg, int result)
 {
   sem_t *waitsem = (sem_t *)arg;
-  sem_post(waitsem);
+  nxsem_post(waitsem);
 }
 
 /****************************************************************************
@@ -1892,7 +1892,7 @@ int usbdev_msc_epread(void *buf, int len)
 void usbdev_msc_stop(void)
 {
   lc823450_dmastop(hdma);
-  sem_post(&dma_wait);
+  nxsem_post(&dma_wait);
 }
 #endif /* CONFIG_USBMSC */
 

arch/arm/src/lpc11xx/lpc11_i2c.c

@@ -239,7 +239,7 @@ static void lpc11_i2c_stop(struct lpc11_i2cdev_s *priv)
                priv->base + LPC11_I2C_CONSET_OFFSET);
     }
 
-  sem_post(&priv->wait);
+  nxsem_post(&priv->wait);
 }
 
 /****************************************************************************
@@ -256,7 +256,7 @@ static void lpc11_i2c_timeout(int argc, uint32_t arg, ...)
 
   irqstate_t flags = enter_critical_section();
   priv->state = 0xff;
-  sem_post(&priv->wait);
+  nxsem_post(&priv->wait);
   leave_critical_section(flags);
 }
 
@@ -299,7 +299,7 @@ static int lpc11_i2c_transfer(FAR struct i2c_master_s *dev,
 
   ret = lpc11_i2c_start(priv);
 
-  sem_post(&priv->mutex);
+  nxsem_post(&priv->mutex);
   return ret;
 }
 
@@ -571,7 +571,7 @@ struct i2c_master_s *lpc11_i2cbus_initialize(int port)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->wait, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->wait, SEM_PRIO_NONE);
 
   /* Allocate a watchdog timer */
 
@@ -610,8 +610,8 @@ int lpc11_i2cbus_uninitialize(FAR struct i2c_master_s * dev)
 
   /* Reset data structures */
 
-  sem_destroy(&priv->mutex);
-  sem_destroy(&priv->wait);
+  nxsem_destroy(&priv->mutex);
+  nxsem_destroy(&priv->wait);
 
   /* Free the watchdog timer */
 

arch/arm/src/lpc11xx/lpc11_spi.c

@@ -202,7 +202,7 @@ static int spi_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
   return OK;
 }

arch/arm/src/lpc11xx/lpc11_ssp.c

@@ -350,7 +350,7 @@ static int ssp_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
   return OK;
 }

arch/arm/src/lpc17xx/lpc17_gpdma.c

@@ -416,7 +416,7 @@ DMA_HANDLE lpc17_dmachannel(void)
 
   /* Return what we found (or not) */
 
-  sem_post(&g_gpdma.exclsem);
+  nxsem_post(&g_gpdma.exclsem);
   return (DMA_HANDLE)dmach;
 }
 

arch/arm/src/lpc17xx/lpc17_i2c.c

@@ -239,7 +239,7 @@ static void lpc17_i2c_stop(struct lpc17_i2cdev_s *priv)
                priv->base + LPC17_I2C_CONSET_OFFSET);
     }
 
-  sem_post(&priv->wait);
+  nxsem_post(&priv->wait);
 }
 
 /****************************************************************************
@@ -256,7 +256,7 @@ static void lpc17_i2c_timeout(int argc, uint32_t arg, ...)
 
   irqstate_t flags = enter_critical_section();
   priv->state = 0xff;
-  sem_post(&priv->wait);
+  nxsem_post(&priv->wait);
   leave_critical_section(flags);
 }
 
@@ -299,7 +299,7 @@ static int lpc17_i2c_transfer(FAR struct i2c_master_s *dev,
 
   ret = lpc17_i2c_start(priv);
 
-  sem_post(&priv->mutex);
+  nxsem_post(&priv->mutex);
   return ret;
 }
 
@@ -576,7 +576,7 @@ struct i2c_master_s *lpc17_i2cbus_initialize(int port)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->wait, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->wait, SEM_PRIO_NONE);
 
   /* Allocate a watchdog timer */
 
@@ -615,8 +615,8 @@ int lpc17_i2cbus_uninitialize(FAR struct i2c_master_s * dev)
 
   /* Reset data structures */
 
-  sem_destroy(&priv->mutex);
-  sem_destroy(&priv->wait);
+  nxsem_destroy(&priv->mutex);
+  nxsem_destroy(&priv->wait);
 
   /* Free the watchdog timer */
 

arch/arm/src/lpc17xx/lpc17_sdcard.c

@@ -304,7 +304,7 @@ struct lpc17_sampleregs_s
 /* Low-level helpers ********************************************************/
 
 static void lpc17_takesem(struct lpc17_dev_s *priv);
-#define     lpc17_givesem(priv) (sem_post(&priv->waitsem))
+#define     lpc17_givesem(priv) (nxsem_post(&priv->waitsem))
 static inline void lpc17_setclock(uint32_t clkcr);
 static void lpc17_configwaitints(struct lpc17_dev_s *priv, uint32_t waitmask,
               sdio_eventset_t waitevents, sdio_eventset_t wkupevents);
@@ -2724,7 +2724,7 @@ FAR struct sdio_dev_s *sdio_initialize(int slotno)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
 
   /* Create a watchdog timer */
 

arch/arm/src/lpc17xx/lpc17_spi.c

@@ -198,7 +198,7 @@ static int spi_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
   return OK;
 }

arch/arm/src/lpc17xx/lpc17_ssp.c

@@ -346,7 +346,7 @@ static int ssp_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
   return OK;
 }

arch/arm/src/lpc17xx/lpc17_usbhost.c

@@ -284,7 +284,7 @@ static void lpc17_putreg(uint32_t val, uint32_t addr);
 /* Semaphores ******************************************************************/
 
 static void lpc17_takesem(sem_t *sem);
-#define lpc17_givesem(s) sem_post(s);
+#define lpc17_givesem(s) nxsem_post(s);
 
 /* Byte stream access helper functions *****************************************/
 
@@ -2268,7 +2268,7 @@ static int lpc17_epalloc(struct usbhost_driver_s *drvr,
        */
 
       nxsem_init(&ed->wdhsem, 0, 0);
-      sem_setprotocol(&ed->wdhsem, SEM_PRIO_NONE);
+      nxsem_setprotocol(&ed->wdhsem, SEM_PRIO_NONE);
 
       /* Link the common tail TD to the ED's TD list */
 
@@ -2307,7 +2307,7 @@ static int lpc17_epalloc(struct usbhost_driver_s *drvr,
           /* No.. destroy it and report the error */
 
           uerr("ERROR: Failed to queue ED for transfer type: %d\n", ed->xfrtype);
-          sem_destroy(&ed->wdhsem);
+          nxsem_destroy(&ed->wdhsem);
           lpc17_edfree(ed);
         }
       else
@@ -2385,7 +2385,7 @@ static int lpc17_epfree(struct usbhost_driver_s *drvr, usbhost_ep_t ep)
 
   /* Destroy the semaphore */
 
-  sem_destroy(&ed->wdhsem);
+  nxsem_destroy(&ed->wdhsem);
 
   /* Put the ED back into the free list */
 
@@ -3648,7 +3648,7 @@ struct usbhost_connection_s *lpc17_usbhost_initialize(int controller)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->pscsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->pscsem, SEM_PRIO_NONE);
 
 #ifndef CONFIG_USBHOST_INT_DISABLE
   priv->ininterval  = MAX_PERINTERVAL;
@@ -3736,7 +3736,7 @@ struct usbhost_connection_s *lpc17_usbhost_initialize(int controller)
    */
 
   nxsem_init(&EDCTRL->wdhsem, 0, 0);
-  sem_setprotocol(&EDCTRL->wdhsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&EDCTRL->wdhsem, SEM_PRIO_NONE);
 
   /* Initialize user-configurable EDs */
 

arch/arm/src/lpc2378/lpc23xx_i2c.c

@@ -244,7 +244,7 @@ static void lpc2378_i2c_stop(struct lpc2378_i2cdev_s *priv)
                priv->base + I2C_CONSET_OFFSET);
     }
 
-  sem_post(&priv->wait);
+  nxsem_post(&priv->wait);
 }
 
 /****************************************************************************
@@ -261,7 +261,7 @@ static void lpc2378_i2c_timeout(int argc, uint32_t arg, ...)
 
   irqstate_t flags = enter_critical_section();
   priv->state = 0xff;
-  sem_post(&priv->wait);
+  nxsem_post(&priv->wait);
   leave_critical_section(flags);
 }
 
@@ -425,7 +425,7 @@ static int lpc2378_i2c_transfer(FAR struct i2c_master_s *dev,
 
   ret = lpc2378_i2c_start(priv);
 
-  sem_post(&priv->mutex);
+  nxsem_post(&priv->mutex);
   return ret;
 }
 
@@ -587,7 +587,7 @@ struct i2c_master_s *lpc2378_i2cbus_initialize(int port)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->wait, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->wait, SEM_PRIO_NONE);
 
   /* Allocate a watchdog timer */
 
@@ -626,8 +626,8 @@ int lpc2378_i2cbus_uninitialize(FAR struct i2c_master_s * dev)
 
   /* Reset data structures */
 
-  sem_destroy(&priv->mutex);
-  sem_destroy(&priv->wait);
+  nxsem_destroy(&priv->mutex);
+  nxsem_destroy(&priv->wait);
 
   /* Free the watchdog timer */
 

arch/arm/src/lpc2378/lpc23xx_spi.c

@@ -205,7 +205,7 @@ static int spi_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
 
   return OK;

arch/arm/src/lpc31xx/lpc31_ehci.c

@@ -430,7 +430,7 @@ static int ehci_wait_usbsts(uint32_t maskbits, uint32_t donebits,
 /* Semaphores ******************************************************************/
 
 static void lpc31_takesem(sem_t *sem);
-#define lpc31_givesem(s) sem_post(s);
+#define lpc31_givesem(s) nxsem_post(s);
 
 /* Allocators ******************************************************************/
 
@@ -3938,7 +3938,7 @@ static int lpc31_epalloc(FAR struct usbhost_driver_s *drvr,
    */
 
   nxsem_init(&epinfo->iocsem, 0, 0);
-  sem_setprotocol(&epinfo->iocsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&epinfo->iocsem, SEM_PRIO_NONE);
 
   /* Success.. return an opaque reference to the endpoint information structure
    * instance
@@ -4927,7 +4927,7 @@ FAR struct usbhost_connection_s *lpc31_ehci_initialize(int controller)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&g_ehci.pscsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&g_ehci.pscsem, SEM_PRIO_NONE);
 
   /* Initialize EP0 */
 
@@ -4971,7 +4971,7 @@ FAR struct usbhost_connection_s *lpc31_ehci_initialize(int controller)
        */
 
       nxsem_init(&rhport->ep0.iocsem, 0, 0);
-      sem_setprotocol(&rhport->iocsem, SEM_PRIO_NONE);
+      nxsem_setprotocol(&rhport->iocsem, SEM_PRIO_NONE);
 
       /* Initialize the public port representation */
 

arch/arm/src/lpc31xx/lpc31_i2c.c

@@ -219,7 +219,7 @@ static void i2c_progress(struct lpc31_i2cdev_s *priv)
       /* FIXME: automatic retry? */
 
       priv->state = I2C_STATE_DONE;
-      sem_post(&priv->wait);
+      nxsem_post(&priv->wait);
       return;
     }
 
@@ -388,7 +388,7 @@ out:
         }
 
       priv->state = I2C_STATE_DONE;
-      sem_post(&priv->wait);
+      nxsem_post(&priv->wait);
     }
 }
 
@@ -427,7 +427,7 @@ static void i2c_timeout(int argc, uint32_t arg, ...)
       /* Mark the transfer as finished */
 
       priv->state = I2C_STATE_DONE;
-      sem_post(&priv->wait);
+      nxsem_post(&priv->wait);
     }
 
   leave_critical_section(flags);
@@ -503,7 +503,7 @@ static int i2c_transfer(FAR struct i2c_master_s *dev, FAR struct i2c_msg_s *msgs
   ret = count - priv->nmsg;
 
   leave_critical_section(flags);
-  sem_post(&priv->mutex);
+  nxsem_post(&priv->mutex);
   return ret;
 }
 
@@ -558,7 +558,7 @@ struct i2c_master_s *lpc31_i2cbus_initialize(int port)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->wait, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->wait, SEM_PRIO_NONE);
 
   /* Enable I2C system clocks */
 

arch/arm/src/lpc31xx/lpc31_spi.c

@@ -459,7 +459,7 @@ static int spi_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
   return OK;
 }

arch/arm/src/lpc43xx/lpc43_ehci.c

@@ -429,7 +429,7 @@ static int ehci_wait_usbsts(uint32_t maskbits, uint32_t donebits,
 /* Semaphores ******************************************************************/
 
 static void lpc43_takesem(sem_t *sem);
-#define lpc43_givesem(s) sem_post(s);
+#define lpc43_givesem(s) nxsem_post(s);
 
 /* Allocators ******************************************************************/
 
@@ -3775,7 +3775,7 @@ static int lpc43_epalloc(FAR struct usbhost_driver_s *drvr,
    */
 
   nxsem_init(&epinfo->iocsem, 0, 0);
-  sem_setprotocol(&epinfo->iocsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&epinfo->iocsem, SEM_PRIO_NONE);
 
   /* Success.. return an opaque reference to the endpoint information structure
    * instance
@@ -4758,7 +4758,7 @@ FAR struct usbhost_connection_s *lpc43_ehci_initialize(int controller)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&g_ehci.pscsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&g_ehci.pscsem, SEM_PRIO_NONE);
 
   /* Initialize EP0 */
 
@@ -4802,7 +4802,7 @@ FAR struct usbhost_connection_s *lpc43_ehci_initialize(int controller)
        */
 
       nxsem_init(&rhport->ep0.iocsem, 0, 0);
-      sem_setprotocol(&rhport->ep0.iocsem, SEM_PRIO_NONE);
+      nxsem_setprotocol(&rhport->ep0.iocsem, SEM_PRIO_NONE);
 
       /* Initialize the public port representation */
 

arch/arm/src/lpc43xx/lpc43_gpdma.c

@@ -417,7 +417,7 @@ DMA_HANDLE lpc43_dmachannel(void)
 
   /* Return what we found (or not) */
 
-  sem_post(&g_gpdma.exclsem);
+  nxsem_post(&g_gpdma.exclsem);
   return (DMA_HANDLE)dmach;
 }
 

arch/arm/src/lpc43xx/lpc43_i2c.c

@@ -225,7 +225,7 @@ static void lpc43_i2c_stop(struct lpc43_i2cdev_s *priv)
                priv->base + LPC43_I2C_CONSET_OFFSET);
     }
 
-  sem_post(&priv->wait);
+  nxsem_post(&priv->wait);
 }
 
 /****************************************************************************
@@ -242,7 +242,7 @@ static void lpc43_i2c_timeout(int argc, uint32_t arg, ...)
 
   irqstate_t flags = enter_critical_section();
   priv->state = 0xff;
-  sem_post(&priv->wait);
+  nxsem_post(&priv->wait);
   leave_critical_section(flags);
 }
 
@@ -406,7 +406,7 @@ static int lpc43_i2c_transfer(FAR struct i2c_master_s *dev,
 
   ret = lpc43_i2c_start(priv);
 
-  sem_post(&priv->mutex);
+  nxsem_post(&priv->mutex);
   return ret;
 }
 
@@ -533,7 +533,7 @@ struct i2c_master_s *lpc43_i2cbus_initialize(int port)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->wait, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->wait, SEM_PRIO_NONE);
 
   /* Allocate a watchdog timer */
 

arch/arm/src/lpc43xx/lpc43_spi.c

@@ -192,7 +192,7 @@ static int spi_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
   return OK;
 }

arch/arm/src/lpc43xx/lpc43_ssp.c

@@ -288,7 +288,7 @@ static int ssp_lock(FAR struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&priv->exclsem);
+      (void)nxsem_post(&priv->exclsem);
     }
 
   return OK;

arch/arm/src/sam34/sam4cm_tc.c

@@ -129,7 +129,7 @@ struct sam_chan_s
 /* Low-level helpers ********************************************************/
 
 static void sam_takesem(struct sam_chan_s *chan);
-#define     sam_givesem(chan) (sem_post(&chan->exclsem))
+#define     sam_givesem(chan) (nxsem_post(&chan->exclsem))
 
 #ifdef CONFIG_SAM34_TC_REGDEBUG
 static void sam_regdump(struct sam_chan_s *chan, const char *msg);

arch/arm/src/sam34/sam_aes.c

@@ -93,7 +93,7 @@ static void aes_lock(void)
 
 static void aes_unlock(void)
 {
-  sem_post(&lock);
+  nxsem_post(&lock);
 }
 
 static void aes_memcpy(void *out, const void *in, size_t size)

arch/arm/src/sam34/sam_dmac.c

@@ -288,7 +288,7 @@ static void sam_takechsem(void)
 
 static inline void sam_givechsem(void)
 {
-  (void)sem_post(&g_chsem);
+  (void)nxsem_post(&g_chsem);
 }
 
 /****************************************************************************
@@ -315,7 +315,7 @@ static void sam_takedsem(void)
 
 static inline void sam_givedsem(void)
 {
-  (void)sem_post(&g_dsem);
+  (void)nxsem_post(&g_dsem);
 }
 
 /****************************************************************************

arch/arm/src/sam34/sam_hsmci.c

@@ -405,7 +405,7 @@ struct sam_xfrregs_s
 /* Low-level helpers ********************************************************/
 
 static void sam_takesem(struct sam_dev_s *priv);
-#define     sam_givesem(priv) (sem_post(&priv->waitsem))
+#define     sam_givesem(priv) (nxsem_post(&priv->waitsem))
 
 static void sam_configwaitints(struct sam_dev_s *priv, uint32_t waitmask,
               sdio_eventset_t waitevents);
@@ -2687,7 +2687,7 @@ FAR struct sdio_dev_s *sdio_initialize(int slotno)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
 
   /* Create a watchdog timer */
 

arch/arm/src/sam34/sam_spi.c

@@ -745,7 +745,7 @@ static void spi_dmatimeout(int argc, uint32_t arg)
 
   /* Then wake up the waiting thread */
 
-  sem_post(&spics->dmawait);
+  nxsem_post(&spics->dmawait);
 }
 #endif
 
@@ -792,7 +792,7 @@ static void spi_rxcallback(DMA_HANDLE handle, void *arg, int result)
 
   /* Then wake up the waiting thread */
 
-  sem_post(&spics->dmawait);
+  nxsem_post(&spics->dmawait);
 }
 #endif
 
@@ -893,7 +893,7 @@ static int spi_lock(struct spi_dev_s *dev, bool lock)
     }
   else
     {
-      (void)sem_post(&spi->spisem);
+      (void)nxsem_post(&spi->spisem);
     }
 
   return OK;
@@ -1888,7 +1888,7 @@ struct spi_dev_s *sam_spibus_initialize(int port)
        */
 
       nxsem_init(&spics->dmawait, 0, 0);
-      sem_setprotocol(&spics->dmawait, SEM_PRIO_NONE);
+      nxsem_setprotocol(&spics->dmawait, SEM_PRIO_NONE);
 
       /* Create a watchdog time to catch DMA timeouts */
 

arch/arm/src/sam34/sam_twi.c

@@ -141,7 +141,7 @@ struct twi_dev_s
 /* Low-level helper functions */
 
 static void twi_takesem(sem_t *sem);
-#define     twi_givesem(sem) (sem_post(sem))
+#define     twi_givesem(sem) (nxsem_post(sem))
 
 #ifdef CONFIG_SAM34_TWI_REGDEBUG
 static bool twi_checkreg(struct twi_dev_s *priv, bool wr,
@@ -974,7 +974,7 @@ struct i2c_master_s *sam_i2cbus_initialize(int bus)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
 
   /* Allocate a watchdog timer */
 
@@ -1017,8 +1017,8 @@ int sam_i2cbus_uninitialize(FAR struct i2c_master_s * dev)
 
   /* Reset data structures */
 
-  sem_destroy(&priv->exclsem);
-  sem_destroy(&priv->waitsem);
+  nxsem_destroy(&priv->exclsem);
+  nxsem_destroy(&priv->waitsem);
 
   /* Free the watchdog timer */
 

arch/arm/src/sama5/sam_adc.c

@@ -2174,7 +2174,7 @@ void sam_adc_lock(FAR struct sam_adc_s *priv)
 void sam_adc_unlock(FAR struct sam_adc_s *priv)
 {
   ainfo("Unlocking\n");
-  sem_post(&priv->exclsem);
+  nxsem_post(&priv->exclsem);
 }
 
 /****************************************************************************

arch/arm/src/sama5/sam_can.c

@@ -199,7 +199,7 @@ static void can_dumpmbregs(FAR struct sam_can_s *priv, FAR const char *msg);
 /* Semaphore helpers */
 
 static void can_semtake(FAR struct sam_can_s *priv);
-#define can_semgive(priv) sem_post(&priv->exclsem)
+#define can_semgive(priv) nxsem_post(&priv->exclsem)
 
 /* Mailboxes */
 

arch/arm/src/sama5/sam_dmac.c

@@ -501,7 +501,7 @@ static void sam_takechsem(struct sam_dmac_s *dmac)
 
 static inline void sam_givechsem(struct sam_dmac_s *dmac)
 {
-  (void)sem_post(&dmac->chsem);
+  (void)nxsem_post(&dmac->chsem);
 }
 
 /****************************************************************************
@@ -528,7 +528,7 @@ static void sam_takedsem(struct sam_dmac_s *dmac)
 
 static inline void sam_givedsem(struct sam_dmac_s *dmac)
 {
-  (void)sem_post(&dmac->dsem);
+  (void)nxsem_post(&dmac->dsem);
 }
 
 /****************************************************************************

arch/arm/src/sama5/sam_ehci.c

@@ -309,7 +309,7 @@ static int ehci_wait_usbsts(uint32_t maskbits, uint32_t donebits,
 /* Semaphores ******************************************************************/
 
 static void sam_takesem(sem_t *sem);
-#define sam_givesem(s) sem_post(s);
+#define sam_givesem(s) nxsem_post(s);
 
 /* Allocators ******************************************************************/
 
@@ -3759,7 +3759,7 @@ static int sam_epalloc(FAR struct usbhost_driver_s *drvr,
    */
 
   nxsem_init(&epinfo->iocsem, 0, 0);
-  sem_setprotocol(&epinfo->iocsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&epinfo->iocsem, SEM_PRIO_NONE);
 
   /* Success.. return an opaque reference to the endpoint information structure
    * instance
@@ -4798,7 +4798,7 @@ FAR struct usbhost_connection_s *sam_ehci_initialize(int controller)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&g_ehci.pscsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&g_ehci.pscsem, SEM_PRIO_NONE);
 
   /* Initialize EP0 */
 
@@ -4842,7 +4842,7 @@ FAR struct usbhost_connection_s *sam_ehci_initialize(int controller)
        */
 
       nxsem_init(&rhport->ep0.iocsem, 0, 0);
-      sem_setprotocol(&rhport->ep0.iocsem, SEM_PRIO_NONE);
+      nxsem_setprotocol(&rhport->ep0.iocsem, SEM_PRIO_NONE);
 
       /* Initialize the public port representation */
 

arch/arm/src/sama5/sam_hsmci.c

@@ -464,7 +464,7 @@ struct sam_dev_s
 /* Low-level helpers ********************************************************/
 
 static void sam_takesem(struct sam_dev_s *priv);
-#define     sam_givesem(priv) (sem_post(&priv->waitsem))
+#define     sam_givesem(priv) (nxsem_post(&priv->waitsem))
 
 #ifdef CONFIG_SAMA5_HSMCI_REGDEBUG
 static bool sam_checkreg(struct sam_dev_s *priv, bool wr,
@@ -3304,7 +3304,7 @@ FAR struct sdio_dev_s *sdio_initialize(int slotno)
    * priority inheritance enabled.
    */
 
-  sem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
+  nxsem_setprotocol(&priv->waitsem, SEM_PRIO_NONE);
 
   /* Create a watchdog timer */