readme_countingsemdemo.txt

vxworks 下多线程编程事例代码 包括：管道

FLE LIST -
 	      countingSemDemo.c
 
 DESCRIPTION -
 	      Counting semaphore example.  Using binary semaphores for task
 	      synchronization may, if the events can occur rapidly enough, cause
 	      a loss of data, i.e. an event can be missed if the events can 
 	      occur faster then a task can process them.
 	      Using counting semaphores may solve this problem. This 
 	      program demonstrates task synchronization using counting 
 	      semaphores. The user can also select to use a binary semaphore 
 	      instead of a counting semaphore in this demonstration, for
 	      comparision between the two semaphores.
 
 	      To run this code invoke the function countingSemDemo()
 
 RUNNING DEMO -
 	      Place the countingSemDemo.c file in your <Tornado> dir. Depending 
 	      on the target you have, define the CPU in your compile line and
 	      use the Makefile in the BSP dir. to compile.
 
 	      Run countingSemDemo() on vxworks target.
 
 TESTED ON -   Host/Target : Solaris 2.5.1 / mv1604
 	      VxWorks     : 5.3.1
 
 	      EXAMPLE COMPILE LINE - 
 			    make CPU=PPC604 countingSemDemo.o
 
 % make countingSemDemo.o
 ccppc -B/petaluma1/mayur/tor101-ppc/host/sun4-solaris2/lib/gcc-lib/ 
 -mstrict-align -ansi -nostdinc -O2 -fvolatile -fno-builtin -fno-for-scope 
 -Wall -I/h   -I. -I/petaluma1/mayur/tor101-ppc/target/config/all 
 -I/petaluma1/mayur/tor101-ppc/target/h 
 -I/petaluma1/mayur/tor101-ppc/target/src/config 
 -I/petaluma1/mayur/tor101-ppc/target/src/drv -DCPU=PPC604  -DMV1600 
 -DTARGET_DIR="\"mv1604\""   -c countingSemDemo.c
 
 OUTPUTS/LOGFILE -
 
 On VxWorks target:
 ==================
 
 -> sp countingSemDemo, 'c'
 task spawned: id = 5b7b40, name = u0
 value = 5995328 = 0x5b7b40
 
 The Output on Console:
 ======================
 Semaphore Id        : 0x7fd238    
 Semaphore Type      : COUNTING  
 Task Queuing        : PRIORITY  
 Pended Tasks        : 0         
 Count               : 2         
 
 semaphore taken 1 times
 
 Semaphore Id        : 0x7fd238    
 Semaphore Type      : COUNTING  
 Task Queuing        : PRIORITY  
 Pended Tasks        : 0         
 Count               : 1         
 
 semaphore taken 2 times
 
 Semaphore Id        : 0x7fd238    
 Semaphore Type      : COUNTING  
 Task Queuing        : PRIORITY  
 Pended Tasks        : 0         
 Count               : 0         
 
 semaphore taken 3 times
 
 On VxWorks target:
 ==================
 
 -> sp countingSemDemo, 'b'
 task spawned: id = 5b7b40, name = u1
 value = 5995328 = 0x5b7b40
 
 The Output on Console:
 ======================
 Semaphore Id        : 0x7fd238    
 Semaphore Type      : BINARY    
 Task Queuing        : PRIORITY  
 Pended Tasks        : 0         
 State               : FULL      
 
 semaphore taken 1 times
 
 Semaphore Id        : 0x7fd238    
 Semaphore Type      : BINARY    
 Task Queuing        : PRIORITY  
 Pended Tasks        : 0         
 State               : EMPTY     
 
 semaphore taken 2 times