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p1_mythread - MyThread Library 1 Assignment Design a...

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± ;8y?Thread :7ibrary
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² &/,ssignment ● 'esign a non³preemptive thread library ● &reate the library file´ mytheadµa ● 8se “context” system calls´ ○ swapcontext¶ makecontext¶ getcontext¶ …
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· ?Thread state diagram running blocked ready blocked blocked blocked one thread can be running stop when no threads in ready queue one or more blocked queues ± ² · ¸ ±µ +ead of ready 4 ²µ <ield ·µ :ait¶ join ¸µ 6ignal¶ exit ¹ends joinº » »µ &reate
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¸ ;lan ±µ 8nderstand context routines ○ :rite test program that switches between ² threads ±µ ,mplement create¹º¶ yield¹º ²µ ,mplement fork¹º¶ join¹º ·µ ,mplement semaphores
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» >Semaphore ● 6emaphore 6 – integer variable ● 7wo standard operations modify 6´ acquire¹º and release¹º ○ 2riginally called 3¹º and 9¹º ● /ess complicated ● &an only be accessed via two indivisible ¹atomicº operations acquire¹6º { ¼¼ also called´ wait while ¹6 ½ ¾º ¼¿ no³op ¿¼À 6³³À } release¹6º { ¼¼ also called´ signal
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